utils upgrade

utils/.local/bin/is

@@ -1,4 +1,22 @@
 #!/usr/bin/env bash
 set -eo pipefail
 
+if [[ "$1" == "-h" || "$1" == "--help" ]]; then
+    cat <<EOF
+Usage: $(basename "$0") [-h] <command>
+
+Check if a command is available.
+
+Options:
+    -h, --help    Show this help message
+
+Arguments:
+    command       Command to check
+
+Returns 0 if command exists, 1 otherwise.
+
+EOF
+    exit 0
+fi
+
 [ -n "$1" ] && command -v "$1" || exit 1