Bash arguments parsing snippet.

Drew Stokes

#!/bin/bashPARAMS=""while (( "$#" )); do
  case "$1" in
    -a|--my-boolean-flag)
      MY_FLAG=0
      shift
      ;;
    -b|--my-flag-with-argument)
      if [ -n "$2" ] && [ ${2:0:1} != "-" ]; then
        MY_FLAG_ARG=$2
        shift 2
      else
        echo "Error: Argument for $1 is missing" >&2
        exit 1
      fi
      ;;
    -*|--*=) # unsupported flags
      echo "Error: Unsupported flag $1" >&2
      exit 1
      ;;
    *) # preserve positional arguments
      PARAMS="$PARAMS $1"
      shift
      ;;
  esac
done# set positional arguments in their proper place
eval set -- "$PARAMS"

Remisa Yousefvand

#!/bin/bash

POSITIONAL=()
while [[ $# > 0 ]]; do
    case "$1" in
        -f|--flag)
        echo flag: $1
        shift # shift once since flags have no values
        ;;
        -s|--switch)
        echo switch $1 with value: $2
        shift 2 # shift twice to bypass switch and its value
        ;;
        *) # unknown flag/switch
        POSITIONAL+=("$1")
        shift
        ;;
    esac
done

set -- "${POSITIONAL[@]}" # restore positional params

From:

• Drew Stokes
• Remisa Yousefvand