A simple CLI parser in Bash

simple-cli-parser.bash

#!/usr/bin/env bash

print_help () { echo "Option -f \${file}: Set file"; exit 0; }
fail () { echo "Error: $*" >&2; exit 1; }
unset file

OPTIND=1
while getopts :f:h-: option
do case $option in
       h ) print_help;;
       f ) file=$OPTARG;;
       - ) case $OPTARG in
               file ) fail "Option \"$OPTARG\" missing argument";;
               file=* ) file=${OPTARG#*=};;
               help ) print_help;;
               help=* ) fail "Option \"${OPTARG%%=*}\" has unexpected argument";;
               * ) fail "Unknown long option \"${OPTARG%%=*}\"";;
            esac;;
        '?' ) fail "Unknown short option \"$OPTARG\"";;
        : ) fail "Short option \"$OPTARG\" missing argument";;
        * ) fail "Bad state in getopts (OPTARG=\"$OPTARG\")";;
   esac
done
shift $((OPTIND-1))

echo "File is ${file-unset}"

for (( i=1; i<=$#; ++i ))
do printf "\$@[%d]=\"%s\"\n" $i "${@:i:1}"
done

@Honor1234560