args.sh

#!/bin/bash

#
# Parse command flags and positional arguments regardless
# of argument order
#

# placeholder for postional arguments
PARAMS=""

# iterate through all command-line arguments
while (( "$#" )); do
  case "$1" in 
    #
    # Custom flag processing
    #
    # -r|--role)
    #   # do stuff
    #   shift 2 # flag with value
    #   ;;

    #
    # Standard processing
    #
    --) # end option parsing
      shift
      break
      ;;
    -*|--*=) # unsupported flags
      echo "Error: Unsupported flag $1"
      exit 1
      ;;
    *) # save postitional args
      PARAMS="$PARAMS $1"
      shift
      ;;
  esac
done

# reimport position arguments as $1 $2 etc
eval set -- "$PARAMS"