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helpers/arg-parser/README.md

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+# Argument parser for bash scripts
+
+More info:
+* 🇷🇺 [axenov.dev/bash-args](https://axenov.dev/bash-args/)
+* 🇺🇸 [axenov.dev/en/bash-processing-arguments-in-a-script-when-called-from-the-shell/](https://axenov.dev/en/bash-processing-arguments-in-a-script-when-called-from-the-shell)
+
+Tested in Ubuntu 20.04.2 LTS in:
+
+```
+bash 5.0.17(1)-release (x86_64-pc-linux-gnu)
+zsh 5.8 (x86_64-ubuntu-linux-gnu)
+```
+
+## Version history
+
+```
+v1.0 - initial
+v1.1 - arg(): improved skipping uninteresting args
+     - arg(): check next arg to be valid value
+v1.2 - removed all 'return' statements
+     - arg(): error message corrected
+     - new examples
+v1.3 - argl(): improved flag check
+     - some text corrections
+v1.4 - new function argn()
+     - some text corrections
+v1.5 - arg(), grep_match(): fixed searching for -e argument
+     - grep_match(): redirect output into /dev/null
+```