diff --git a/README.md b/README.md
index 638e5aa..e80223e 100644
--- a/README.md
+++ b/README.md
@@ -8,14 +8,17 @@ Without 3rd-party dependencies.
 
 These formats are supported for now: `http`, `curl`, `wget`.
 
-> This project was quickly written in my spare time to solve one exact problem in one NDA-project, so it may
-> contain stupid errors and (for sure) doesn't cover all possible cases according to collection schema.
-> So feel free to propose your improvements.
+> This project has been started and quickly written in my spare time to solve one exact problem in one NDA-project,
+> so it may contain stupid errors and (for sure) doesn't cover all possible cases according to collection schema.
+> Feel free to propose your improvements.
+
+Versions older than the latest are not supported, only current one is.
+If you found an error in old version please ensure if an error you found has been fixed in latest version.
+So please always use the latest version of `pm-convert`.
 
 ## Supported features
 
-* [collection schema **v2.1**](https://schema.postman.com/json/collection/v2.1.0/collection.json);
-* `Bearer` auth;
+* collection schemas [**v2.1**](https://schema.postman.com/json/collection/v2.1.0/collection.json) and [**v2.0**](https://schema.postman.com/json/collection/v2.0.0/collection.json);
 * replace vars in requests by stored in collection and environment file;
 * export one or several collections (or even whole directories) into one or all of formats supported at the same time;
 * all headers (including disabled for `http`-format);
@@ -25,7 +28,7 @@ These formats are supported for now: `http`, `curl`, `wget`.
 ## Planned features
 
 - support as many as possible/necessary of authentication kinds (_currently only `Bearer` supported_);
-- support as many as possible/necessary of body formats (_currently only `json` and `formdata`_);
+- support as many as possible/necessary of body formats (_currently only `json` and `formdata` supported_);
 - documentation generation support (markdown) with response examples (if present) (#6);
 - maybe some another convert formats (like httpie or something...);
 - better logging;
@@ -65,6 +68,7 @@ Possible ARGUMENTS:
         -e, --env           - use environment file with variables to replace in requests
         --var "NAME=VALUE"  - force replace specified env variable called NAME with custom VALUE
         -p, --preserve      - do not delete OUTPUT_PATH (if exists)
+            --dump          - convert provided arguments into settings file in `pwd`
         -h, --help          - show this help message and exit
         -v, --version       - show version info and exit
 
@@ -134,6 +138,62 @@ In such case collection itself places in single root object called `collection`
 
 So, pm-convert will just raise actual data up on top level and write into disk.
 
+## Settings file
+
+You may want to specify parameters once and just use them everytime without explicit defining arguments to `pm-convert`.
+
+This might be done in several ways.
+
+1. Save this file as `pm-convert-settings.json` in your project directory:
+
+   ```json
+   {
+       "directories": [],
+       "files": [],
+       "environment": "",
+       "output": "",
+       "preserveOutput": false,
+       "formats": [],
+       "vars": {}
+   }
+   ```
+   
+   Fill it with values you need.
+
+2. Add `--dump` at the end of your command and all arguments you provided will be converted and saved as
+   `pm-convert-settings.json` in your curent working directory. For example in `--help` file will contain this:
+
+   ```json
+   {
+       "directories": [
+           "~/team",
+           "~/personal"
+       ],
+       "files": [
+           "~/dir1/first.postman_collection.json",
+           "~/dir2/second.postman_collection.json"
+       ],
+       "environment": "~/localhost.postman_environment.json",
+       "output": "~/postman_export",
+       "preserveOutput": false,
+       "formats": [
+           "http",
+           "curl",
+           "wget",
+           "v2.0",
+           "v2.1"
+       ],
+       "vars": {
+           "myvar": "some value"
+       }
+   }
+   ```
+
+   If settings file already exists then you will be asked what to do: overwrite it, back it up or exit.
+
+Once settings file saved in current you can just run `pm-convert`.
+Settings will be applied like if you pass them explicitly via arguments.
+
 ## How to implement a new format
 
 1. Create new namespace in `./src/Converters` and name it according to format of your choice.
diff --git a/composer.json b/composer.json
index fe966c0..dbd39ee 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,8 @@
     "require": {
         "php": "^8.1",
         "ext-json": "*",
-        "ext-mbstring": "*"
+        "ext-mbstring": "*",
+        "ext-readline": "*"
     },
     "bin": ["pm-convert"],
     "autoload": {
diff --git a/pm-convert b/pm-convert
index cb64cd5..1546575 100755
--- a/pm-convert
+++ b/pm-convert
@@ -24,10 +24,10 @@ is_null($file) && throw new RuntimeException('Unable to locate autoload.php file
 
 $processor = new Processor($argv);
 try {
-    $processor->convert();
+    $processor->handle();
 } catch (InvalidArgumentException $e) {
     fwrite(STDERR, sprintf('ERROR: %s%s', $e->getMessage(), EOL));
-    print(implode(EOL, $processor->usage()));
+    print(implode(EOL, Processor::usage()));
     die(1);
 } catch (Exception $e) {
     fwrite(STDERR, sprintf('ERROR: %s%s', $e->getMessage(), EOL));
diff --git a/src/Collection.php b/src/Collection.php
index 891419b..1428715 100644
--- a/src/Collection.php
+++ b/src/Collection.php
@@ -4,6 +4,8 @@ declare(strict_types = 1);
 
 namespace PmConverter;
 
+use Exception;
+use Generator;
 use JsonException;
 use Stringable;
 
@@ -16,6 +18,8 @@ use Stringable;
  */
 class Collection implements Stringable
 {
+    public readonly CollectionVersion $version;
+
     /**
      * Closed constructor so that we could use factory methods
      *
@@ -24,10 +28,11 @@ class Collection implements Stringable
     private function __construct(protected object $json)
     {
         // specific case when collection has been exported via postman api
-        if (isset($json->collection)) {
+        if (property_exists($json, 'collection')) {
             $json = $json->collection;
         }
         $this->json = $json;
+        $this->version = $this->detectVersion();
     }
 
     /**
@@ -88,7 +93,7 @@ class Collection implements Stringable
      *
      * @return CollectionVersion
      */
-    public function version(): CollectionVersion
+    protected function detectVersion(): CollectionVersion
     {
         return match (true) {
             str_contains($this->json->info->schema, '/v2.0.') => CollectionVersion::Version20,
@@ -96,4 +101,72 @@ class Collection implements Stringable
             default => CollectionVersion::Unknown
         };
     }
+
+    /**
+     * Returns the collection version from raw file
+     *
+     * @param string $filepath
+     * @return CollectionVersion
+     * @throws Exception
+     */
+    public static function detectFileVersion(string $filepath): CollectionVersion
+    {
+        $handle = fopen($filepath, 'r');
+        if ($handle === false) {
+            throw new Exception("Cannot open file for reading: $filepath");
+        }
+        $content = '';
+        // Postman collection files may be HUGE and I don't need to parse
+        // them here to find value .info.schema field because normally it
+        // is stored at the beginning of a file, so if it's not then this
+        // is a user problem, not mine.
+        while (\mb_strlen($content) <= 2048) {
+            $content .= fgets($handle, 50);
+            if (str_contains($content, 'https://schema.getpostman.com/json/collection')) {
+                if (str_contains($content, '/v2.0.')) {
+                    return CollectionVersion::Version20;
+                }
+                if (str_contains($content, '/v2.1.')) {
+                    return CollectionVersion::Version21;
+                }
+            }
+        }
+        return CollectionVersion::Unknown;
+    }
+
+    /**
+     * Iterates over collection request items and returns item associated by its path in folder
+     *
+     * @param mixed|null $item
+     * @return Generator
+     */
+    public function iterate(mixed $item = null): Generator
+    {
+        $is_recursive = !is_null($item);
+        $folder = $is_recursive ? $item : $this->json;
+        static $dir_tree;
+        $path = DS . ($is_recursive ? implode(DS, $dir_tree ?? []) : '');
+        foreach ($folder->item as $subitem) {
+            if ($this->isItemFolder($subitem)) {
+                $dir_tree[] = $subitem->name;
+                yield from $this->iterate($subitem);
+                continue;
+            }
+            yield $path => $subitem;
+        }
+        $is_recursive && array_pop($dir_tree);
+    }
+
+    /**
+     * Checks whether item contains another items or not
+     *
+     * @param object $item
+     * @return bool
+     */
+    protected function isItemFolder(object $item): bool
+    {
+        return !empty($item->item)
+            && is_array($item->item)
+            && empty($item->request);
+    }
 }
diff --git a/src/Converters/Abstract/AbstractConverter.php b/src/Converters/Abstract/AbstractConverter.php
index 669be45..74018f7 100644
--- a/src/Converters/Abstract/AbstractConverter.php
+++ b/src/Converters/Abstract/AbstractConverter.php
@@ -5,21 +5,19 @@ declare(strict_types=1);
 namespace PmConverter\Converters\Abstract;
 
 use Exception;
+use Iterator;
 use PmConverter\Collection;
-use PmConverter\Converters\{
-    ConverterContract,
-    RequestContract};
+use PmConverter\Converters\RequestContract;
 use PmConverter\Environment;
-use PmConverter\Exceptions\{
-    CannotCreateDirectoryException,
-    DirectoryIsNotWriteableException,
-    InvalidHttpVersionException};
+use PmConverter\Exceptions\CannotCreateDirectoryException;
+use PmConverter\Exceptions\DirectoryIsNotWriteableException;
+use PmConverter\Exceptions\InvalidHttpVersionException;
 use PmConverter\FileSystem;
 
 /**
  *
  */
-abstract class AbstractConverter implements ConverterContract
+abstract class AbstractConverter
 {
     /**
      * @var Collection|null
@@ -32,53 +30,66 @@ abstract class AbstractConverter implements ConverterContract
     protected string $outputPath;
 
     /**
-     * @var Environment|null
+     * @var RequestContract[] Converted requests
      */
-    protected ?Environment $env = null;
+    protected array $requests = [];
 
     /**
-     * Sets an environment with vars
+     * Sets output path
      *
-     * @param Environment $env
+     * @param string $outputPath
      * @return $this
      */
-    public function withEnv(Environment $env): static
+    public function to(string $outputPath): self
     {
-        $this->env = $env;
+        $this->outputPath = sprintf('%s%s%s', $outputPath, DS, static::OUTPUT_DIR);
         return $this;
     }
 
     /**
-     * Creates a new directory to save a converted collection into
-     *
-     * @param string $outputPath
-     * @return void
-     * @throws CannotCreateDirectoryException
-     * @throws DirectoryIsNotWriteableException
-     */
-    protected function prepareOutputDir(string $outputPath): void
-    {
-        $outputPath = sprintf('%s%s%s', $outputPath, DS, static::OUTPUT_DIR);
-        $this->outputPath = FileSystem::makeDir($outputPath);
-    }
-
-    /**
-     * Converts collection requests
+     * Converts requests from collection
      *
      * @param Collection $collection
-     * @param string $outputPath
-     * @return void
+     * @return static
      * @throws CannotCreateDirectoryException
      * @throws DirectoryIsNotWriteableException
      * @throws Exception
      */
-    public function convert(Collection $collection, string $outputPath): void
+    public function convert(Collection $collection): static
     {
-        $this->prepareOutputDir($outputPath);
         $this->collection = $collection;
-        $this->setVariables();
-        foreach ($collection->item as $item) {
-            $this->convertItem($item);
+        $this->outputPath = FileSystem::makeDir($this->outputPath);
+        $this->setCollectionVars();
+        foreach ($collection->iterate() as $path => $item) {
+            // $this->requests[$path][] = $this->makeRequest($item);
+            $this->writeRequest($this->makeRequest($item), $path);
+        }
+        return $this;
+    }
+
+    /**
+     * Returns converted requests
+     *
+     * @return Iterator<string, RequestContract>
+     */
+    public function converted(): Iterator
+    {
+        foreach ($this->requests as $path => $requests) {
+            foreach ($requests as $request) {
+                yield $path => $request;
+            }
+        }
+    }
+
+    /**
+     * Writes requests on disk
+     *
+     * @throws Exception
+     */
+    public function flush(): void
+    {
+        foreach ($this->converted() as $path => $request) {
+            $this->writeRequest($request, $path);
         }
     }
 
@@ -87,13 +98,10 @@ abstract class AbstractConverter implements ConverterContract
      *
      * @return $this
      */
-    protected function setVariables(): static
+    protected function setCollectionVars(): static
     {
-        empty($this->env) && $this->env = new Environment($this->collection?->variable);
-        if (!empty($this->collection?->variable)) {
-            foreach ($this->collection->variable as $var) {
-                $this->env[$var->key] = $var->value;
-            }
+        foreach ($this->collection?->variable ?? [] as $var) {
+            Environment::instance()->setCustomVar($var->key, $var->value);
         }
         return $this;
     }
@@ -121,30 +129,6 @@ abstract class AbstractConverter implements ConverterContract
             && empty($item->request);
     }
 
-    /**
-     * Converts an item to request object and writes it into file
-     *
-     * @throws Exception
-     */
-    protected function convertItem(mixed $item): void
-    {
-        if ($this->isItemFolder($item)) {
-            static $dir_tree;
-            foreach ($item->item as $subitem) {
-                $dir_tree[] = $item->name;
-                $path = implode(DS, $dir_tree);
-                if ($this->isItemFolder($subitem)) {
-                    $this->convertItem($subitem);
-                } else {
-                    $this->writeRequest($this->initRequest($subitem), $path);
-                }
-                array_pop($dir_tree);
-            }
-        } else {
-            $this->writeRequest($this->initRequest($item));
-        }
-    }
-
     /**
      * Initialiazes request object to be written in file
      *
@@ -152,17 +136,18 @@ abstract class AbstractConverter implements ConverterContract
      * @return RequestContract
      * @throws InvalidHttpVersionException
      */
-    protected function initRequest(object $item): RequestContract
+    protected function makeRequest(object $item): RequestContract
     {
         $request_class = static::REQUEST_CLASS;
 
         /** @var RequestContract $request */
         $request = new $request_class();
         $request->setName($item->name);
+        $request->setVersion($this->collection->version);
         $request->setHttpVersion(1.1); //TODO http version?
         $request->setDescription($item->request?->description ?? null);
         $request->setVerb($item->request->method);
-        $request->setUrl($item->request->url->raw);
+        $request->setUrl($item->request->url);
         $request->setHeaders($item->request->header);
         $request->setAuth($item->request?->auth ?? $this->collection?->auth ?? null);
         if ($item->request->method !== 'GET' && !empty($item->request->body)) {
@@ -196,18 +181,9 @@ abstract class AbstractConverter implements ConverterContract
      */
     protected function interpolate(string $content): string
     {
-        if (!$this->env?->hasVars()) {
-            return $content;
-        }
-        $matches = [];
-        if (preg_match_all('/\{\{.*}}/m', $content, $matches, PREG_PATTERN_ORDER) > 0) {
-            foreach ($matches[0] as $key => $var) {
-                if (str_contains($content, $var)) {
-                    $content = str_replace($var, $this->env[$var] ?: $var, $content);
-                    unset($matches[0][$key]);
-                }
-            }
-        }
-        return $content;
+        $replace = static fn ($a) => Environment::instance()->var($var = $a[0]) ?: $var;
+        return Environment::instance()->hasVars()
+            ? preg_replace_callback('/\{\{.*}}/m', $replace, $content)
+            : $content;
     }
 }
diff --git a/src/Converters/Abstract/AbstractRequest.php b/src/Converters/Abstract/AbstractRequest.php
index 7af094e..ea177cb 100644
--- a/src/Converters/Abstract/AbstractRequest.php
+++ b/src/Converters/Abstract/AbstractRequest.php
@@ -4,10 +4,10 @@ declare(strict_types=1);
 
 namespace PmConverter\Converters\Abstract;
 
+use PmConverter\CollectionVersion;
 use PmConverter\Converters\RequestContract;
-use PmConverter\Exceptions\{
-    EmptyHttpVerbException,
-    InvalidHttpVersionException};
+use PmConverter\Exceptions\EmptyHttpVerbException;
+use PmConverter\Exceptions\InvalidHttpVersionException;
 use PmConverter\HttpVersion;
 use Stringable;
 
@@ -22,9 +22,9 @@ abstract class AbstractRequest implements Stringable, RequestContract
     protected string $verb;
 
     /**
-     * @var string URL where to send a request
+     * @var object|string URL where to send a request
      */
-    protected string $url;
+    protected object|string $url;
 
     /**
      * @var float HTTP protocol version
@@ -56,6 +56,15 @@ abstract class AbstractRequest implements Stringable, RequestContract
      */
     protected string $bodymode = 'raw';
 
+
+    protected CollectionVersion $version;
+
+    public function setVersion(CollectionVersion $version): static
+    {
+        $this->version = $version;
+        return $this;
+    }
+
     /**
      * @inheritDoc
      */
@@ -133,7 +142,7 @@ abstract class AbstractRequest implements Stringable, RequestContract
     /**
      * @inheritDoc
      */
-    public function setUrl(string $url): static
+    public function setUrl(object|string $url): static
     {
         $this->url = $url;
         return $this;
@@ -142,9 +151,9 @@ abstract class AbstractRequest implements Stringable, RequestContract
     /**
      * @inheritDoc
      */
-    public function getUrl(): string
+    public function getRawUrl(): string
     {
-        return $this->url ?: '<empty url>';
+        return is_object($this->url) ? $this->url->raw : $this->url;
     }
 
     /**
@@ -186,7 +195,11 @@ abstract class AbstractRequest implements Stringable, RequestContract
         if (!empty($auth)) {
             switch ($auth->type) {
                 case 'bearer':
-                    $this->setHeader('Authorization', 'Bearer ' . $auth->{$auth->type}[0]->value);
+                    $this->setHeader('Authorization', 'Bearer ' . match ($this->version) {
+                        CollectionVersion::Version20 => $auth->{$auth->type}->token,
+                        CollectionVersion::Version21 => $auth->{$auth->type}[0]->value,
+                        default => null
+                    });
                     break;
                 default:
                     break;
diff --git a/src/Converters/ConvertFormat.php b/src/Converters/ConvertFormat.php
index 3bebb54..9aa9eca 100644
--- a/src/Converters/ConvertFormat.php
+++ b/src/Converters/ConvertFormat.php
@@ -5,12 +5,11 @@ declare(strict_types=1);
 namespace PmConverter\Converters;
 
 
-use PmConverter\Converters\{
-    Curl\CurlConverter,
-    Http\HttpConverter,
-    Postman20\Postman20Converter,
-    Postman21\Postman21Converter,
-    Wget\WgetConverter};
+use PmConverter\Converters\Curl\CurlConverter;
+use PmConverter\Converters\Http\HttpConverter;
+use PmConverter\Converters\Postman20\Postman20Converter;
+use PmConverter\Converters\Postman21\Postman21Converter;
+use PmConverter\Converters\Wget\WgetConverter;
 
 enum ConvertFormat: string
 {
@@ -19,4 +18,26 @@ enum ConvertFormat: string
     case Wget = WgetConverter::class;
     case Postman20 = Postman20Converter::class;
     case Postman21 = Postman21Converter::class;
+
+    public static function fromArg(string $arg): self
+    {
+        return match ($arg) {
+            'http' => ConvertFormat::Http,
+            'curl' => ConvertFormat::Curl,
+            'wget' => ConvertFormat::Wget,
+            'v2.0' => ConvertFormat::Postman20,
+            'v2.1' => ConvertFormat::Postman21,
+        };
+    }
+
+    public function toArg(): string
+    {
+        return match ($this) {
+            ConvertFormat::Http => 'http',
+            ConvertFormat::Curl => 'curl',
+            ConvertFormat::Wget => 'wget',
+            ConvertFormat::Postman20 => 'v2.0',
+            ConvertFormat::Postman21 => 'v2.1',
+        };
+    }
 }
diff --git a/src/Converters/Curl/CurlConverter.php b/src/Converters/Curl/CurlConverter.php
index 5b11944..22a4c88 100644
--- a/src/Converters/Curl/CurlConverter.php
+++ b/src/Converters/Curl/CurlConverter.php
@@ -4,11 +4,9 @@ declare(strict_types=1);
 
 namespace PmConverter\Converters\Curl;
 
-use PmConverter\Converters\{
-    Abstract\AbstractConverter,
-    ConverterContract};
+use PmConverter\Converters\Abstract\AbstractConverter;
 
-class CurlConverter extends AbstractConverter implements ConverterContract
+class CurlConverter extends AbstractConverter
 {
     protected const FILE_EXT = 'sh';
 
diff --git a/src/Converters/Curl/CurlRequest.php b/src/Converters/Curl/CurlRequest.php
index 259d807..ec2c404 100644
--- a/src/Converters/Curl/CurlRequest.php
+++ b/src/Converters/Curl/CurlRequest.php
@@ -72,7 +72,7 @@ class CurlRequest extends AbstractRequest
                 "curl \ ",
                 "\t--http1.1 \ ", //TODO proto
                 "\t--request $this->verb \ ",
-                "\t--location $this->url \ ",
+                "\t--location {$this->getRawUrl()} \ ",
             ],
             $this->prepareHeaders(),
             $this->prepareBody()
diff --git a/src/Converters/Http/HttpConverter.php b/src/Converters/Http/HttpConverter.php
index e344172..741ddfc 100644
--- a/src/Converters/Http/HttpConverter.php
+++ b/src/Converters/Http/HttpConverter.php
@@ -4,11 +4,9 @@ declare(strict_types=1);
 
 namespace PmConverter\Converters\Http;
 
-use PmConverter\Converters\{
-    Abstract\AbstractConverter,
-    ConverterContract};
+use PmConverter\Converters\Abstract\AbstractConverter;
 
-class HttpConverter extends AbstractConverter implements ConverterContract
+class HttpConverter extends AbstractConverter
 {
     protected const FILE_EXT = 'http';
 
diff --git a/src/Converters/Http/HttpRequest.php b/src/Converters/Http/HttpRequest.php
index 8a304be..8da9ae3 100644
--- a/src/Converters/Http/HttpRequest.php
+++ b/src/Converters/Http/HttpRequest.php
@@ -5,8 +5,7 @@ declare(strict_types=1);
 namespace PmConverter\Converters\Http;
 
 use PmConverter\Converters\Abstract\AbstractRequest;
-use PmConverter\Exceptions\{
-    EmptyHttpVerbException};
+use PmConverter\Exceptions\EmptyHttpVerbException;
 
 /**
  * Class to determine file content with http request format
@@ -29,7 +28,7 @@ class HttpRequest extends AbstractRequest
      */
     protected function prepareHeaders(): array
     {
-        $output[] = sprintf('%s %s HTTP/%s', $this->getVerb(), $this->getUrl(), $this->getHttpVersion());
+        $output[] = sprintf('%s %s HTTP/%s', $this->getVerb(), $this->getRawUrl(), $this->getHttpVersion());
         foreach ($this->headers as $name => $data) {
             $output[] = sprintf('%s%s: %s', $data['disabled'] ? '# ' : '', $name, $data['value']);
         }
diff --git a/src/Converters/Postman20/Postman20Converter.php b/src/Converters/Postman20/Postman20Converter.php
index c068baa..4b34e48 100644
--- a/src/Converters/Postman20/Postman20Converter.php
+++ b/src/Converters/Postman20/Postman20Converter.php
@@ -6,9 +6,7 @@ namespace PmConverter\Converters\Postman20;
 
 use PmConverter\Collection;
 use PmConverter\CollectionVersion;
-use PmConverter\Converters\{
-    Abstract\AbstractConverter,
-    ConverterContract};
+use PmConverter\Converters\Abstract\AbstractConverter;
 use PmConverter\Exceptions\CannotCreateDirectoryException;
 use PmConverter\Exceptions\DirectoryIsNotWriteableException;
 use PmConverter\FileSystem;
@@ -16,7 +14,7 @@ use PmConverter\FileSystem;
 /**
  * Converts Postman Collection v2.1 to v2.0
  */
-class Postman20Converter extends AbstractConverter implements ConverterContract
+class Postman20Converter extends AbstractConverter
 {
     protected const FILE_EXT = 'v20.postman_collection.json';
 
@@ -26,25 +24,25 @@ class Postman20Converter extends AbstractConverter implements ConverterContract
      * Converts collection requests
      *
      * @param Collection $collection
-     * @param string $outputPath
-     * @return void
+     * @return static
      * @throws CannotCreateDirectoryException
      * @throws DirectoryIsNotWriteableException
      */
-    public function convert(Collection $collection, string $outputPath): void
+    public function convert(Collection $collection): static
     {
         $this->collection = $collection;
         // if data was exported from API, here is already valid json to
         // just flush it in file, otherwise we need to convert it deeper
-        if ($this->collection->version() === CollectionVersion::Version21) {
+        if ($this->collection->version === CollectionVersion::Version21) {
             $this->collection->info->schema = str_replace('/v2.1.', '/v2.0.', $this->collection->info->schema);
             $this->convertAuth($this->collection->raw());
             foreach ($this->collection->item as $item) {
                 $this->convertItem($item);
             }
         }
-        $this->prepareOutputDir($outputPath);
+        $this->outputPath = FileSystem::makeDir($this->outputPath);
         $this->writeCollection();
+        return $this;
     }
 
     /**
@@ -97,11 +95,11 @@ class Postman20Converter extends AbstractConverter implements ConverterContract
         if (empty($request->auth)) {
             return;
         }
-        $type = $request->auth->type;
-        if ($type !== 'noauth' && is_array($request->auth->$type)) {
-            $auth = [];
+        $auth = ['type' => 'noauth'];
+        $type = strtolower($request->auth->type);
+        if ($type !== 'noauth') {
             foreach ($request->auth->$type as $param) {
-                $auth[$param->key] = $param->value;
+                $auth[$param->key] = $param->value ?? '';
             }
             $request->auth->$type = (object)$auth;
         }
diff --git a/src/Converters/Postman21/Postman21Converter.php b/src/Converters/Postman21/Postman21Converter.php
index 73f1b5d..3ae59b9 100644
--- a/src/Converters/Postman21/Postman21Converter.php
+++ b/src/Converters/Postman21/Postman21Converter.php
@@ -6,9 +6,7 @@ namespace PmConverter\Converters\Postman21;
 
 use PmConverter\Collection;
 use PmConverter\CollectionVersion;
-use PmConverter\Converters\{
-    Abstract\AbstractConverter,
-    ConverterContract};
+use PmConverter\Converters\Abstract\AbstractConverter;
 use PmConverter\Exceptions\CannotCreateDirectoryException;
 use PmConverter\Exceptions\DirectoryIsNotWriteableException;
 use PmConverter\FileSystem;
@@ -16,7 +14,7 @@ use PmConverter\FileSystem;
 /**
  * Converts Postman Collection v2.0 to v2.1
  */
-class Postman21Converter extends AbstractConverter implements ConverterContract
+class Postman21Converter extends AbstractConverter
 {
     protected const FILE_EXT = 'v21.postman_collection.json';
 
@@ -26,25 +24,25 @@ class Postman21Converter extends AbstractConverter implements ConverterContract
      * Converts collection requests
      *
      * @param Collection $collection
-     * @param string $outputPath
-     * @return void
+     * @return static
      * @throws CannotCreateDirectoryException
      * @throws DirectoryIsNotWriteableException
      */
-    public function convert(Collection $collection, string $outputPath): void
+    public function convert(Collection $collection): static
     {
         $this->collection = $collection;
         // if data was exported from API, here is already valid json to
         // just flush it in file, otherwise we need to convert it deeper
-        if ($this->collection->version() === CollectionVersion::Version20) {
+        if ($this->collection->version === CollectionVersion::Version20) {
             $this->collection->info->schema = str_replace('/v2.0.', '/v2.1.', $this->collection->info->schema);
             $this->convertAuth($this->collection->raw());
             foreach ($this->collection->item as $item) {
                 $this->convertItem($item);
             }
         }
-        $this->prepareOutputDir($outputPath);
+        $this->outputPath = FileSystem::makeDir($this->outputPath);
         $this->writeCollection();
+        return $this;
     }
 
     /**
diff --git a/src/Converters/RequestContract.php b/src/Converters/RequestContract.php
index 424f31e..77ea405 100644
--- a/src/Converters/RequestContract.php
+++ b/src/Converters/RequestContract.php
@@ -86,7 +86,7 @@ interface RequestContract
      *
      * @return string
      */
-    public function getUrl(): string;
+    public function getRawUrl(): string;
 
     /**
      * Sets headers from collection item to request object
@@ -116,7 +116,7 @@ interface RequestContract
     /**
      * Sets authorization headers
      *
-     * @param object|null $auth
+     * @param object $auth
      * @return $this
      */
     public function setAuth(object $auth): static;
diff --git a/src/Converters/Wget/WgetConverter.php b/src/Converters/Wget/WgetConverter.php
index 63563bb..7a0d4fa 100644
--- a/src/Converters/Wget/WgetConverter.php
+++ b/src/Converters/Wget/WgetConverter.php
@@ -4,11 +4,9 @@ declare(strict_types=1);
 
 namespace PmConverter\Converters\Wget;
 
-use PmConverter\Converters\{
-    Abstract\AbstractConverter,
-    ConverterContract};
+use PmConverter\Converters\Abstract\AbstractConverter;
 
-class WgetConverter extends AbstractConverter implements ConverterContract
+class WgetConverter extends AbstractConverter
 {
     protected const FILE_EXT = 'sh';
 
diff --git a/src/Converters/Wget/WgetRequest.php b/src/Converters/Wget/WgetRequest.php
index 5d9f5c7..d0f53cf 100644
--- a/src/Converters/Wget/WgetRequest.php
+++ b/src/Converters/Wget/WgetRequest.php
@@ -77,16 +77,16 @@ class WgetRequest extends AbstractRequest
         if ($this->getBodymode() === 'formdata') {
             if ($this->getBody()) {
                 if ($this->getVerb() === 'GET') {
-                    $output[] = sprintf("\t%s?%s", $this->getUrl(), http_build_query($this->prepareBody()));
+                    $output[] = sprintf("\t%s?%s", $this->getRawUrl(), http_build_query($this->prepareBody()));
                 } else {
                     $output[] = sprintf("\t--body-data '%s' \ ", http_build_query($this->prepareBody()));
-                    $output[] = sprintf("\t%s", $this->getUrl());
+                    $output[] = sprintf("\t%s", $this->getRawUrl());
                 }
             }
         } else {
             if ($this->getVerb() !== 'GET') {
                 $output[] = sprintf("\t--body-data '%s' \ ", implode("\n", $this->prepareBody()));
-                $output[] = sprintf("\t%s", $this->getUrl());
+                $output[] = sprintf("\t%s", $this->getRawUrl());
             }
         }
         return implode(EOL, array_merge($output, ['']));
diff --git a/src/Environment.php b/src/Environment.php
index ab3bcaf..3fe8bf8 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -4,23 +4,138 @@ declare(strict_types=1);
 
 namespace PmConverter;
 
-class Environment implements \ArrayAccess
+use ArrayAccess;
+use JsonException;
+
+/**
+ *
+ */
+class Environment implements ArrayAccess
 {
+    /**
+     * @var string Path to env file
+     */
+    protected static string $filepath = '';
+
+    /**
+     * @var Environment
+     */
+    protected static Environment $instance;
+
     /**
      * @var array
      */
-    protected array $vars = [];
+    protected array $ownVars = [];
 
     /**
-     * @param object|null $env
+     * @var array
      */
-    public function __construct(protected ?object $env)
+    protected array $customVars = [];
+
+    public static function instance(): static
     {
-        if (!empty($env->values)) {
-            foreach ($env->values as $var) {
-                $this->vars[static::formatKey($var->key)] = $var->value;
-            }
+        return static::$instance ??= new static();
+    }
+
+    /**
+     * @param string $filepath
+     * @return $this
+     * @throws JsonException
+     */
+    public function readFromFile(string $filepath): static
+    {
+        $content = file_get_contents(static::$filepath = $filepath);
+        $content = json_decode($content, flags: JSON_THROW_ON_ERROR); //TODO try-catch
+        $content || throw new JsonException("not a valid environment: $filepath");
+        property_exists($content, 'environment') && $content = $content->environment;
+        if (!property_exists($content, 'id') && !property_exists($content, 'name')) {
+            throw new JsonException("not a valid environment: $filepath");
         }
+        return $this->setOwnVars($content->values);
+    }
+
+    /**
+     * @param array $vars
+     * @return $this
+     */
+    protected function setOwnVars(array $vars): static
+    {
+        foreach ($vars as $key => $value) {
+            is_object($value) && [$key, $value] = [$value->key, $value->value];
+            $this->setOwnVar($key, $value);
+        }
+        return $this;
+    }
+
+    /**
+     * Sets value to some environment own variable
+     *
+     * @param string $name
+     * @param string $value
+     * @return $this
+     */
+    protected function setOwnVar(string $name, string $value): static
+    {
+        $this->ownVars[static::formatKey($name)] = $value;
+        return $this;
+    }
+
+    /**
+     * @param array $vars
+     * @return $this
+     */
+    public function setCustomVars(array $vars): static
+    {
+        foreach ($vars as $key => $value) {
+            is_object($value) && [$key, $value] = [$value->key, $value->value];
+            $this->setCustomVar($key, $value);
+        }
+        return $this;
+    }
+
+    /**
+     * Sets value to some environment own variable
+     *
+     * @param string $name
+     * @param string $value
+     * @return $this
+     */
+    public function setCustomVar(string $name, string $value): static
+    {
+        $this->customVars[static::formatKey($name)] = $value;
+        return $this;
+    }
+
+    /**
+     * Returns value of specific variable
+     *
+     * @param string $name
+     * @return mixed
+     */
+    public function var(string $name): mixed
+    {
+        $format_key = static::formatKey($name);
+        return $this->ownVars[$format_key] ?? $this->customVars[$format_key] ?? null;
+    }
+
+    /**
+     * Returns array of own and custom variables
+     *
+     * @return string[]
+     */
+    public function vars(): array
+    {
+        return array_merge($this->ownVars, $this->customVars);
+    }
+
+    /**
+     * Returns array of custom variables
+     *
+     * @return string[]
+     */
+    public function customVars(): array
+    {
+        return $this->customVars;
     }
 
     /**
@@ -30,15 +145,35 @@ class Environment implements \ArrayAccess
      */
     public function hasVars(): bool
     {
-        return !empty($this->vars);
+        return !empty($this->ownVars) && !empty($this->customVars);
     }
 
+
+
+
+
+
+
+
+
+
+
+
+
+    /**
+     * Closed constructor
+     */
+    protected function __construct()
+    {
+    }
+
+
     /**
      * @inheritDoc
      */
     public function offsetExists(mixed $offset): bool
     {
-        return array_key_exists(static::formatKey($offset), $this->vars);
+        return array_key_exists(static::formatKey($offset), $this->vars());
     }
 
     /**
@@ -46,7 +181,7 @@ class Environment implements \ArrayAccess
      */
     public function offsetGet(mixed $offset): mixed
     {
-        return $this->vars[static::formatKey($offset)] ?? null;
+        return $this->var($offset);
     }
 
     /**
@@ -54,7 +189,7 @@ class Environment implements \ArrayAccess
      */
     public function offsetSet(mixed $offset, mixed $value): void
     {
-        $this->vars[static::formatKey($offset)] = $value;
+        $this->customVars[static::formatKey($offset)] = $value;
     }
 
     /**
@@ -62,7 +197,7 @@ class Environment implements \ArrayAccess
      */
     public function offsetUnset(mixed $offset): void
     {
-        unset($this->vars[static::formatKey($offset)]);
+        unset($this->customVars[static::formatKey($offset)]);
     }
 
     /**
diff --git a/src/Exceptions/IncorrectSettingsFileException.php b/src/Exceptions/IncorrectSettingsFileException.php
new file mode 100644
index 0000000..dfcf034
--- /dev/null
+++ b/src/Exceptions/IncorrectSettingsFileException.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PmConverter\Exceptions;
+
+use Exception;
+
+class IncorrectSettingsFileException extends Exception
+{
+}
diff --git a/src/FileSystem.php b/src/FileSystem.php
index 45c8f1a..75fb9c4 100644
--- a/src/FileSystem.php
+++ b/src/FileSystem.php
@@ -4,12 +4,12 @@ declare(strict_types=1);
 
 namespace PmConverter;
 
+use Exception;
 use JsonException;
-use PmConverter\Exceptions\{
-    CannotCreateDirectoryException,
-    DirectoryIsNotReadableException,
-    DirectoryIsNotWriteableException,
-    DirectoryNotExistsException};
+use PmConverter\Exceptions\CannotCreateDirectoryException;
+use PmConverter\Exceptions\DirectoryIsNotReadableException;
+use PmConverter\Exceptions\DirectoryIsNotWriteableException;
+use PmConverter\Exceptions\DirectoryNotExistsException;
 
 /**
  * Helper class to work with files and directories
@@ -24,7 +24,7 @@ class FileSystem
      */
     public static function normalizePath(string $path): string
     {
-        $path = str_replace('~', $_SERVER['HOME'], $path);
+        $path = str_replace('~/', "{$_SERVER['HOME']}/", $path);
         return rtrim($path, DS);
     }
 
@@ -112,13 +112,14 @@ class FileSystem
      * @param string $path
      * @return bool
      * @throws JsonException
+     * @throws Exception
      */
     public static function isCollectionFile(string $path): bool
     {
-        return (!empty($path = trim(static::normalizePath($path))))
+        return (!empty($path = static::normalizePath($path)))
             && str_ends_with($path, '.postman_collection.json')
             && file_exists($path)
             && is_readable($path)
-            && Collection::fromFile($path)->version() !== CollectionVersion::Unknown;
+            && Collection::detectFileVersion($path) !== CollectionVersion::Unknown;
     }
 }
diff --git a/src/Processor.php b/src/Processor.php
index a8bab6b..73d57d7 100644
--- a/src/Processor.php
+++ b/src/Processor.php
@@ -5,93 +5,74 @@ declare(strict_types=1);
 namespace PmConverter;
 
 use Exception;
+use Generator;
 use InvalidArgumentException;
+use JetBrains\PhpStorm\NoReturn;
 use JsonException;
-use PmConverter\Converters\{
-    ConverterContract,
-    ConvertFormat};
-use PmConverter\Exceptions\{
-    CannotCreateDirectoryException,
-    DirectoryIsNotReadableException,
-    DirectoryIsNotWriteableException,
-    DirectoryNotExistsException};
+use PmConverter\Converters\Abstract\AbstractConverter;
+use PmConverter\Converters\ConverterContract;
+use PmConverter\Converters\ConvertFormat;
+use PmConverter\Exceptions\CannotCreateDirectoryException;
+use PmConverter\Exceptions\DirectoryIsNotReadableException;
+use PmConverter\Exceptions\DirectoryIsNotWriteableException;
+use PmConverter\Exceptions\DirectoryNotExistsException;
+use PmConverter\Exceptions\IncorrectSettingsFileException;
 
+/**
+ * Main class
+ */
 class Processor
 {
     /**
      * Converter version
      */
-    public const VERSION = '1.5.0';
-
-    /**
-     * @var string[] Paths to collection files
-     */
-    protected array $collectionPaths = [];
-
-    /**
-     * @var string Output path where to put results in
-     */
-    protected string $outputPath;
-
-    /**
-     * @var bool Flag to remove output directories or not before conversion started
-     */
-    protected bool $preserveOutput = false;
-
-    /**
-     * @var string[] Additional variables
-     */
-    protected array $vars;
-
-    /**
-     * @var ConvertFormat[] Formats to convert a collections into
-     */
-    protected array $formats;
-
-    /**
-     * @var ConverterContract[] Converters will be used for conversion according to choosen formats
-     */
-    protected array $converters = [];
-
-    /**
-     * @var Collection[] Collections that will be converted into choosen formats
-     */
-    protected array $collections = [];
+    public const VERSION = '1.6.0';
 
     /**
      * @var int Initial timestamp
      */
-    protected int $initTime;
+    protected readonly int $initTime;
 
     /**
      * @var int Initial RAM usage
      */
-    protected int $initRam;
+    protected readonly int $initRam;
 
     /**
-     * @var string Path to environment file
+     * @var Settings Settings                               (lol)
      */
-    protected string $envFile;
+    protected Settings $settings;
+
+    /**
+     * @var ConverterContract[] Converters will be used for conversion according to chosen formats
+     */
+    protected array $converters = [];
+
+    /**
+     * @var bool Do we need to save settings file and exit or not?
+     */
+    protected bool $needDumpSettings = false;
 
     /**
      * @var Environment
      */
-    protected Environment $env;
-
-    /**
-     * @var bool Flag to output some debug-specific messages
-     */
-    protected bool $devMode = false;
+    public Environment $env;
 
     /**
      * Constructor
      *
      * @param array $argv Arguments came from cli
      */
-    public function __construct(protected array $argv)
+    public function __construct(protected readonly array $argv)
     {
         $this->initTime = hrtime(true);
         $this->initRam = memory_get_usage(true);
+        $this->settings = Settings::init();
+        $this->env = Environment::instance()
+            ->readFromFile($this->settings->envFilepath())
+            ->setCustomVars($this->settings->vars());
+        $this->parseArgs();
+        $this->needDumpSettings && $this->dumpSettingsFile();
     }
 
     /**
@@ -102,21 +83,11 @@ class Processor
      */
     protected function parseArgs(): void
     {
-        if (count($this->argv) < 2) {
-            die(implode(EOL, $this->usage()) . EOL);
-        }
         foreach ($this->argv as $idx => $arg) {
             switch ($arg) {
                 case '-f':
                 case '--file':
-                    $rawpath = $this->argv[$idx + 1];
-                    $normpath = FileSystem::normalizePath($rawpath);
-                    if (!FileSystem::isCollectionFile($normpath)) {
-                        throw new InvalidArgumentException(
-                            sprintf("not a valid collection:%s\t%s %s", EOL, $arg, $rawpath)
-                        );
-                    }
-                    $this->collectionPaths[] = $this->argv[$idx + 1];
+                    $this->settings->addFilePath($this->argv[$idx + 1]);
                     break;
 
                 case '-o':
@@ -124,7 +95,7 @@ class Processor
                     if (empty($this->argv[$idx + 1])) {
                         throw new InvalidArgumentException('-o is required');
                     }
-                    $this->outputPath = $this->argv[$idx + 1];
+                    $this->settings->setOutputPath($this->argv[$idx + 1]);
                     break;
 
                 case '-d':
@@ -132,54 +103,57 @@ class Processor
                     if (empty($this->argv[$idx + 1])) {
                         throw new InvalidArgumentException('a directory path is expected for -d (--dir)');
                     }
-                    $rawpath = $this->argv[$idx + 1];
-                    $files = array_filter(
-                        FileSystem::dirContents($rawpath),
-                        static fn($filename) => FileSystem::isCollectionFile($filename)
-                    );
-                    $this->collectionPaths = array_unique(array_merge($this?->collectionPaths ?? [], $files));
+                    $this->settings->addDirPath($this->argv[$idx + 1]);
                     break;
 
                 case '-e':
                 case '--env':
-                    $this->envFile = FileSystem::normalizePath($this->argv[$idx + 1]);
+                    $this->settings->setEnvFilepath($this->argv[$idx + 1]);
                     break;
 
                 case '-p':
                 case '--preserve':
-                    $this->preserveOutput = true;
+                    $this->settings->setPreserveOutput(true);
                     break;
 
                 case '--http':
-                    $this->formats[ConvertFormat::Http->name] = ConvertFormat::Http;
+                    $this->settings->addFormat(ConvertFormat::Http);
                     break;
 
                 case '--curl':
-                    $this->formats[ConvertFormat::Curl->name] = ConvertFormat::Curl;
+                    $this->settings->addFormat(ConvertFormat::Curl);
                     break;
 
                 case '--wget':
-                    $this->formats[ConvertFormat::Wget->name] = ConvertFormat::Wget;
+                    $this->settings->addFormat(ConvertFormat::Wget);
                     break;
 
                 case '--v2.0':
-                    $this->formats[ConvertFormat::Postman20->name] = ConvertFormat::Postman20;
+                    $this->settings->addFormat(ConvertFormat::Postman20);
                     break;
 
                 case '--v2.1':
-                    $this->formats[ConvertFormat::Postman21->name] = ConvertFormat::Postman21;
+                    $this->settings->addFormat(ConvertFormat::Postman21);
                     break;
 
                 case '-a':
                 case '--all':
                     foreach (ConvertFormat::cases() as $format) {
-                        $this->formats[$format->name] = $format;
+                        $this->settings->addFormat($format);
                     }
                     break;
 
                 case '--var':
-                    [$var, $value] = explode('=', trim($this->argv[$idx + 1]));
-                    $this->vars[$var] = $value;
+                    //TODO split by first equal sign
+                    $this->env->setCustomVar(...explode('=', trim($this->argv[$idx + 1])));
+                    break;
+
+                case '--dev':
+                    $this->settings->setDevMode(true);
+                    break;
+
+                case '--dump':
+                    $this->needDumpSettings = true;
                     break;
 
                 case '-v':
@@ -189,23 +163,63 @@ class Processor
                 case '-h':
                 case '--help':
                     die(implode(EOL, $this->usage()) . EOL);
-
-                case '--dev':
-                    $this->devMode = true;
-                    break;
             }
         }
-        if (empty($this->collectionPaths)) {
+        if (empty($this->settings->collectionPaths())) {
             throw new InvalidArgumentException('there are no collections to convert');
         }
-        if (empty($this->outputPath)) {
+        if (empty($this->settings->outputPath())) {
             throw new InvalidArgumentException('-o is required');
         }
-        if (empty($this->formats)) {
-            $this->formats = [ConvertFormat::Http->name => ConvertFormat::Http];
+        if (empty($this->settings->formats())) {
+            $this->settings->addFormat(ConvertFormat::Http);
         }
     }
 
+    /**
+     * Handles input command
+     *
+     * @return void
+     * @throws CannotCreateDirectoryException
+     * @throws DirectoryIsNotReadableException
+     * @throws DirectoryIsNotWriteableException
+     * @throws DirectoryNotExistsException
+     * @throws JsonException
+     * @throws IncorrectSettingsFileException
+     */
+    public function handle(): void
+    {
+        $this->prepareOutputDirectory();
+        $this->initConverters();
+        $this->convert();
+    }
+
+    /**
+     * Writes all settings into file if --dump provided
+     *
+     * @return never
+     */
+    #[NoReturn]
+    protected function dumpSettingsFile(): never
+    {
+        $answer = 'o';
+        if ($this->settings::fileExists()) {
+            echo 'Settings file already exists: ' . $this->settings::filepath() . EOL;
+            echo 'Do you want to (o)verwrite it, (b)ackup it and create new one or (c)ancel (default)?' . EOL;
+            $answer = strtolower(trim(readline('> ')));
+        }
+        if (!in_array($answer, ['o', 'b'])) {
+            die('Current settings file has not been changed' . EOL);
+        }
+        if ($answer === 'b') {
+            $filepath = $this->settings->backup();
+            printf("Settings file has been backed up to file:%s\t%s%s", EOL, $filepath, EOL);
+        }
+        $this->settings->dump($this->env->customVars());
+        printf("Arguments has been converted into settings file:%s\t%s%s", EOL, $this->settings::filepath(), EOL);
+        die('Review and edit it if needed.' . EOL);
+    }
+
     /**
      * Initializes output directory
      *
@@ -215,100 +229,74 @@ class Processor
      * @throws DirectoryNotExistsException
      * @throws DirectoryIsNotReadableException
      */
-    protected function initOutputDirectory(): void
+    protected function prepareOutputDirectory(): void
     {
-        if (isset($this?->outputPath) && !$this->preserveOutput) {
-            FileSystem::removeDir($this->outputPath);
+        if (!$this->settings->isPreserveOutput()) {
+            FileSystem::removeDir($this->settings->outputPath());
         }
-        FileSystem::makeDir($this->outputPath);
+        FileSystem::makeDir($this->settings->outputPath());
     }
 
     /**
-     * Initializes converters according to choosen formats
+     * Initializes converters according to chosen formats
      *
      * @return void
      */
     protected function initConverters(): void
     {
-        foreach ($this->formats as $type) {
-            $this->converters[$type->name] = new $type->value($this->preserveOutput);
+        foreach ($this->settings->formats() as $type) {
+            $this->converters[$type->name] = new $type->value($this->settings->isPreserveOutput());
         }
         unset($this->formats);
     }
 
     /**
-     * Initializes collection objects
+     * Generates collections from settings
      *
+     * @return Generator<Collection>
      * @throws JsonException
      */
-    protected function initCollections(): void
+    protected function newCollection(): Generator
     {
-        foreach ($this->collectionPaths as $collectionPath) {
-            $collection = Collection::fromFile($collectionPath);
-            $this->collections[$collection->name()] = $collection;
+        foreach ($this->settings->collectionPaths() as $collectionPath) {
+            yield Collection::fromFile($collectionPath);
         }
-        unset($this->collectionPaths, $content);
-    }
-
-    /**
-     * Initializes environment object
-     *
-     * @return void
-     * @throws JsonException
-     */
-    protected function initEnv(): void
-    {
-        if (!isset($this->envFile)) {
-            return;
-        }
-        $content = file_get_contents(FileSystem::normalizePath($this->envFile));
-        $content = json_decode($content, flags: JSON_THROW_ON_ERROR);
-        if (!property_exists($content, 'environment') || empty($content?->environment)) {
-            throw new JsonException("not a valid environment: $this->envFile");
-        }
-        $this->env = new Environment($content->environment);
-        foreach ($this->vars as $var => $value) {
-            $this->env[$var] = $value;
-        }
-        unset($this->vars, $this->envFile, $content, $var, $value);
     }
 
     /**
      * Begins a conversion
      *
-     * @throws Exception
+     * @throws JsonException
      */
     public function convert(): void
     {
-        $this->parseArgs();
-        $this->initOutputDirectory();
-        $this->initConverters();
-        $this->initCollections();
-        $this->initEnv();
-        $count = count($this->collections);
+        $count = count($this->settings->collectionPaths());
         $current = $success = 0;
+        $collection = null;
         print(implode(EOL, array_merge($this->version(), $this->copyright())) . EOL . EOL);
-        foreach ($this->collections as $collectionName => $collection) {
+        foreach ($this->newCollection() as $collection) {
             ++$current;
-            printf("Converting '%s' (%d/%d):%s", $collectionName, $current, $count, EOL);
-            foreach ($this->converters as $type => $exporter) {
+            printf("Converting '%s' (%d/%d):%s", $collection->name(), $current, $count, EOL);
+            foreach ($this->converters as $type => $converter) {
+                /** @var AbstractConverter $converter */
                 printf('> %s%s', strtolower($type), EOL);
-                $outputPath = sprintf('%s%s%s', $this->outputPath, DS, $collectionName);
-                if (!empty($this->env)) {
-                    $exporter->withEnv($this->env);
-                }
+                $outputPath = sprintf('%s%s%s', $this->settings->outputPath(), DS, $collection->name());
                 try {
-                    $exporter->convert($collection, $outputPath);
-                    printf('  OK: %s%s', $exporter->getOutputPath(), EOL);
+                    $converter = $converter->to($outputPath);
+                    $converter = $converter->convert($collection);
+                    $converter->flush();
+                    printf('  OK: %s%s', $converter->getOutputPath(), EOL);
                 } catch (Exception $e) {
                     printf('  ERROR %s: %s%s', $e->getCode(), $e->getMessage(), EOL);
-                    $this->devMode && array_map(static fn ($line) => printf("  %s%s", $line, EOL), $e->getTrace());
+                    if ($this->settings->isDevMode()) {
+                        array_map(static fn ($line) => printf('  %s%s', $line, EOL), $e->getTrace());
+                    }
                 }
             }
             print(EOL);
             ++$success;
         }
-        unset($this->converters, $type, $exporter, $outputPath, $this->collections, $collectionName, $collection);
+        unset($this->converters, $type, $converter, $outputPath, $this->collections, $collectionName, $collection);
         $this->printStats($success, $current);
     }
 
@@ -334,18 +322,19 @@ class Processor
     /**
      * @return string[]
      */
-    public function version(): array
+    public static function version(): array
     {
-        return ["Postman collection converter v" . self::VERSION];
+        return ['Postman collection converter v' . self::VERSION];
     }
 
     /**
      * @return string[]
      */
-    public function copyright(): array
+    public static function copyright(): array
     {
+        $years = ($year = (int)date('Y')) > 2023 ? "2023 - $year" : $year;
         return [
-            'Anthony Axenov (c) ' . date('Y') . ", MIT license",
+            "Anthony Axenov (c) $years, MIT license",
             'https://git.axenov.dev/anthony/pm-convert'
         ];
     }
@@ -353,9 +342,9 @@ class Processor
     /**
      * @return array
      */
-    public function usage(): array
+    public static function usage(): array
     {
-        return array_merge($this->version(), [
+        return array_merge(static::version(), [
             'Usage:',
             "\t./pm-convert -f|-d PATH -o OUTPUT_PATH [ARGUMENTS] [FORMATS]",
             "\tphp pm-convert -f|-d PATH -o OUTPUT_PATH [ARGUMENTS] [FORMATS]",
@@ -369,6 +358,7 @@ class Processor
             "\t-e, --env           - use environment file with variables to replace in requests",
             "\t--var \"NAME=VALUE\"  - force replace specified env variable called NAME with custom VALUE",
             "\t-p, --preserve      - do not delete OUTPUT_PATH (if exists)",
+            "\t    --dump          - convert provided arguments into settings file in `pwd",
             "\t-h, --help          - show this help message and exit",
             "\t-v, --version       - show version info and exit",
             '',
@@ -401,6 +391,6 @@ class Processor
             "        -o ~/postman_export \ ",
             "       --all",
             "",
-        ], $this->copyright());
+        ], static::copyright());
     }
 }
diff --git a/src/Settings.php b/src/Settings.php
new file mode 100644
index 0000000..4b65aff
--- /dev/null
+++ b/src/Settings.php
@@ -0,0 +1,313 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PmConverter;
+
+use InvalidArgumentException;
+use JsonException;
+use PmConverter\Converters\ConvertFormat;
+use PmConverter\Exceptions\IncorrectSettingsFileException;
+
+/**
+ * Class responsible for settings storage and dumping
+ */
+class Settings
+{
+    /**
+     * @var string Full path to settings file
+     */
+    protected static string $filepath;
+
+    /**
+     * @var bool Flag to output some debug-specific messages
+     */
+    protected bool $devMode = false;
+
+    /**
+     * @var string[] Paths to collection directories
+     */
+    protected array $directories = [];
+
+    /**
+     * @var string[] Paths to collection files
+     */
+    protected array $collectionPaths = [];
+
+    /**
+     * @var string Output path where to put results in
+     */
+    protected string $outputPath = '';
+
+    /**
+     * @var bool Flag to remove output directories or not before conversion started
+     */
+    protected bool $preserveOutput = false;
+
+    /**
+     * @var string[] Additional variables
+     */
+    protected array $vars = [];
+
+    /**
+     * @var ConvertFormat[] Formats to convert a collections into
+     */
+    protected array $formats = [];
+
+    /**
+     * @var string Path to environment file
+     */
+    protected string $envFilepath = '';
+
+    /**
+     * @return bool
+     */
+    public static function fileExists(): bool
+    {
+        return file_exists(self::$filepath);
+    }
+
+    /**
+     * @return self
+     * @throws IncorrectSettingsFileException
+     * @throws JsonException
+     */
+    public static function init(): self
+    {
+        $content = '{}';
+        self::$filepath = sprintf('%s%spm-convert-settings.json', $_SERVER['PWD'], DS);
+        if (self::fileExists()) {
+            $content = trim(file_get_contents(self::$filepath));
+        }
+        try {
+            $settings = json_decode($content ?: '{}', flags: JSON_THROW_ON_ERROR);
+        } catch (JsonException $e) {
+            throw new IncorrectSettingsFileException('Incorrect settings file: ' . $e->getMessage(), $e->getCode());
+        }
+        return new self($settings);
+    }
+
+    /**
+     * Returns full path to settings file
+     *
+     * @return string
+     */
+    public static function filepath(): string
+    {
+        return self::$filepath;
+    }
+
+    /**
+     * @param object $settings
+     * @throws JsonException
+     */
+    protected function __construct(object $settings)
+    {
+        foreach ($settings->directories ?? [] as $path) {
+            $this->addDirPath($path);
+        }
+        foreach ($settings->files ?? [] as $path) {
+            $this->addFilePath($path);
+        }
+        $this->setDevMode(!empty($settings->devMode));
+        $this->setPreserveOutput(!empty($settings->preserveOutput));
+        isset($settings->environment) && $this->setEnvFilepath($settings->environment);
+        isset($settings->output) && $this->setOutputPath($settings->output);
+        foreach ($settings->formats ?? [] as $format) {
+            $this->addFormat(ConvertFormat::fromArg($format));
+        }
+        foreach ($settings->vars ?? [] as $name => $value) {
+            $this->vars[$name] = $value;
+        }
+    }
+
+    /**
+     * @param string $path
+     * @return void
+     * @throws JsonException
+     */
+    public function addDirPath(string $path): void
+    {
+        $this->directories = array_unique(array_merge(
+            $this->directories ?? [],
+            [FileSystem::normalizePath($path)]
+        ));
+        $files = array_filter(
+            FileSystem::dirContents($path),
+            static fn ($filename) => FileSystem::isCollectionFile($filename)
+        );
+        $this->collectionPaths = array_unique(array_merge($this->collectionPaths ?? [], $files));
+    }
+
+    /**
+     * @param string $path
+     * @return void
+     * @throws JsonException
+     */
+    public function addFilePath(string $path): void
+    {
+        $normpath = FileSystem::normalizePath($path);
+        if (!FileSystem::isCollectionFile($normpath)) {
+            throw new InvalidArgumentException("not a valid collection: $path");
+        }
+        in_array($path, $this->collectionPaths) || $this->collectionPaths[] = $path;
+    }
+
+    /**
+     * @param string $outputPath
+     * @return void
+     */
+    public function setOutputPath(string $outputPath): void
+    {
+        $this->outputPath = $outputPath;
+    }
+
+    /**
+     * @param bool $devMode
+     * @return void
+     */
+    public function setDevMode(bool $devMode): void
+    {
+        $this->devMode = $devMode;
+    }
+
+    /**
+     * @param ConvertFormat $format
+     * @return void
+     */
+    public function addFormat(ConvertFormat $format): void
+    {
+        $this->formats[$format->name] = $format;
+    }
+
+    /**
+     * Returns array of variables
+     *
+     * @return string[]
+     */
+    public function vars(): array
+    {
+        return $this->vars;
+    }
+
+    /**
+     * @param bool $preserveOutput
+     * @return void
+     */
+    public function setPreserveOutput(bool $preserveOutput): void
+    {
+        $this->preserveOutput = $preserveOutput;
+    }
+
+    /**
+     * @param string $filepath
+     * @return void
+     */
+    public function setEnvFilepath(string $filepath): void
+    {
+        $this->envFilepath = FileSystem::normalizePath($filepath);
+    }
+
+    /**
+     * @return bool
+     */
+    public function isDevMode(): bool
+    {
+        return $this->devMode;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function collectionPaths(): array
+    {
+        return $this->collectionPaths;
+    }
+
+    /**
+     * @return string
+     */
+    public function outputPath(): string
+    {
+        return $this->outputPath;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isPreserveOutput(): bool
+    {
+        return $this->preserveOutput;
+    }
+
+    /**
+     * @return ConvertFormat[]
+     */
+    public function formats(): array
+    {
+        return $this->formats;
+    }
+
+    /**
+     * @return string
+     */
+    public function envFilepath(): string
+    {
+        return $this->envFilepath;
+    }
+
+    /**
+     * Determines fieldset of settings JSON
+     *
+     * @return array
+     */
+    public function __serialize(): array
+    {
+        return [
+            'dev' => $this->isDevMode(),
+            'directories' => $this->directories,
+            'files' => $this->collectionPaths(),
+            'environment' => $this->envFilepath(),
+            'output' => $this->outputPath(),
+            'preserve-output' => $this->isPreserveOutput(),
+            'formats' => array_values(array_map(
+                static fn (ConvertFormat $format) => $format->toArg(),
+                $this->formats(),
+            )),
+            'vars' => $this->vars,
+        ];
+    }
+
+    /**
+     * Converts settings into JSON format
+     *
+     * @return string
+     */
+    public function __toString(): string
+    {
+        return json_encode($this->__serialize(), JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+    }
+
+    /**
+     * Writes settings in JSON format into settings file
+     *
+     * @param array $vars
+     * @return bool
+     */
+    public function dump(array $vars = []): bool
+    {
+        count($vars) > 0 && $this->vars = $vars;
+        return file_put_contents(self::$filepath, (string)$this) > 0;
+    }
+
+    /**
+     * Makes a backup file of current settings file
+     *
+     * @return string
+     */
+    public function backup(): string
+    {
+        copy(self::$filepath, $newfilepath = self::$filepath . '.bak.' . time());
+        return $newfilepath;
+    }
+}
diff --git a/tests/AbstractRequestTest.php b/tests/AbstractRequestTest.php
index 54c9c2d..7afd877 100644
--- a/tests/AbstractRequestTest.php
+++ b/tests/AbstractRequestTest.php
@@ -3,9 +3,8 @@
 declare(strict_types=1);
 
 use PHPUnit\Framework\TestCase;
-use PmConverter\Exceptions\{
-    EmptyHttpVerbException,
-    InvalidHttpVersionException};
+use PmConverter\Exceptions\EmptyHttpVerbException;
+use PmConverter\Exceptions\InvalidHttpVersionException;
 
 class AbstractRequestTest extends TestCase
 {
@@ -71,7 +70,7 @@ class AbstractRequestTest extends TestCase
     /**
      * @covers PmConverter\Converters\Abstract\AbstractRequest
      * @covers PmConverter\Converters\Abstract\AbstractRequest::setUrl()
-     * @covers PmConverter\Converters\Abstract\AbstractRequest::getUrl()
+     * @covers PmConverter\Converters\Abstract\AbstractRequest::getRawUrl()
      * @return void
      */
     public function testUrl(): void
@@ -79,7 +78,7 @@ class AbstractRequestTest extends TestCase
         $request = new \PmConverter\Converters\Http\HttpRequest();
         $request->setUrl('http://localhost');
 
-        $this->assertSame('http://localhost', $request->getUrl());
+        $this->assertSame('http://localhost', $request->getRawUrl());
     }
 
     /**