Little bash CLI "parser"

cli-parser.sh

#!/bin/bash

FOO="foooo"
BAR="baaaaar"
BAZ="baaaazzz"

function help() {
  echo "A command-line interface for foo, bar and baz."
  echo
  echo "Example Usage:"
  echo -e "\t ./cli-parser.sh -f fo -b bra -B bza"
  echo
  echo "Available Parameters:"
  echo -e "\t -h|--help \t Show this help"
  echo -e "\t -f|--foo \t Specify foo"
  echo -e "\t -b|--bar \t Specify bar"
  echo -e "\t -B|--baz \t Specify bar"
  exit 0
}

POSITIONAL_ARGS=()
while [[ $# -gt 0 ]]; do
  case $1 in
    -h|--help)
      help
      ;;
    -f|--foo)
      FOO="$2"
      shift # past argument
      shift # past value
      ;;
    -b|--bar)
      BAR="$2"
      shift # past argument
      shift # past value
      ;;
    -B|--baz)
      BAZ="$2"
      shift # past argument
      shift # past value
      ;;
    -*|--*)
      echo "Unknown option $1"
      exit 1
      ;;
    *)
      POSITIONAL_ARGS+=("$1") # save positional arg
      shift # past argument
      ;;
  esac
done

set -- "${POSITIONAL_ARGS[@]}" # restore positional parameters

echo "Given params:"
echo -e "\t FOO: ${FOO}"
echo -e "\t BAR: ${BAR}"
echo -e "\t BAZ: ${BAZ}"

################################################################
################################################################

# OUTPUT EXAMPLE OF HELP PAGE
#
# $ ./cli-parser.sh --help
# A command-line interface for foo, bar and baz.
#
# Example Usage:
#    script.sh -f 
#
# Available Parameters:
#    -h|--help   Show this help
#    -f|--foo    Specify foo
#    -b|--bar    Specify bar
#    -B|--baz    Specify bar
#
#