cmd.template.sh

#!/usr/bin/env bash

set -x

### for opt-parse
_MY_NAME=$(basename $0)
_MY_LOCATION="$(\cd "$(dirname "${BASH_SOURCE:-${(%):-%N}}")"; _pwd=`pwd`/${_MY_NAME};
  \cd "$(dirname `readlink -f ${_pwd} 2> /dev/null||readlink ${_pwd} 2> /dev/null` 2> /dev/null)" ; pwd)"
_MY_VERSION='0.1'
_DEFAULT_ARGS="$@"

show_usage() {
    echo "-----------------------"
}

show_version() {
    echo "${_MY_VERSION}"
}

function post_proc() {
  [ -f $_tempfile ] && rm -f $_tempfile
  exit 0
}

function assert_if_needs_one() {
  if [ -z "$2" ] || [[ "$2" =~ ^-.* ]]; then
      echo "${_MY_NAME}: '$1' requires one argument" > /dev/stderr
      exit 1;
  fi
  _global_opt_flag=1
}

unset _tempfile
trap post_proc 1 2 3 15

## opt-parse
unset _global_opt_flag

for OPT in "$@"
do
  [ ! -z "${_global_opt_flag}" ]&&{
    _global_opt_flag=
    shift 1
    continue
  }

  case "$OPT" in
      '-x' ) # -x ARG
          assert_if_needs_one "$1" "$2"
          # do something
          ;;
      '-y' ) # -y
          # do something
          :
          ;;
      '-z' ) # -z [ARG]
          [[ "$2" =~ ^[a-zA-Z0-9]+ ]] && {
            # if given arg
            _global_opt_flag=1
          } || {
            # if no arg (set default value)
            :
          }
          # do something
          ;;
      -*) # unregistered options
          _NOT_REGISTERED_OPTS="${_NOT_REGISTERED_OPTS} $1"
          ;;
      *) # arguments which is not option
          _NO_OPT_ARGS="${_NO_OPT_ARGS} $1" 
          ;;
  esac

  shift 1
done

unset _global_opt_flag

set -- $_NO_OPT_ARGS
_tempfile=$(mktemp 2>/dev/null||mktemp -t tmp)

// do something

post_proc