bash cli argument example

cli.sh

#!/bin/bash
params="$(getopt -o hviuc: -l help,version,install,update,clean: --name "$0" -- "$@")"
eval set -- "$params"

. ./lib/echos.sh

usage() {
  shrug "Dotfiles Installer"
  echo "Usage:"
  echo "  --help -h -?              Display this help message."
  echo "  --install -i              Install a Python package."
  echo "  --update -u               Update a Python package."
  echo "  --clean -c                Clean a Python package."
  exit 0
}

execute=""
specific_package=""

while [[ $# -gt 0 ]] ; do
    case $1 in
        -h|-\?|--help)
            usage
            exit
            ;;
        -v|--version)
            if [ -n "$2" ]; then
                echo "version: <$2>"
                specific_package=$2
                shift
            fi
            ;;
        -i|--install)
            execute="INSTALL"
            if [ -n "$2" ]; then
                echo "install: <$2>"
                specific_package=$2
                shift
            fi
            ;;
        -u|--update)
            execute="UPDATE"
            if [ -n "$2" ]; then
                specific_package=$2
                echo "update: <$2>"
                shift
            fi
            ;;
        -c|--clean)
            execute="CLEAN"
            if [ -n "$2" ]; then
                specific_package=$2
                echo "clean: <$2>"
                shift
            fi
            ;;
    esac
    shift
done

case $execute in
  "INSTALL")
    echo "INSTALL $specific_package"
    ;;
  "UPDATE")
    echo "UPDATE $specific_package"
    ;;
  "CLEAN")
    echo "CLEAN $specific_package"
    ;;
esac