A starter bash script. Just change `FILE` and fill in the rest

TEMPLATE.sh

#! /usr/bin/env bash
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set -eu;
set -o pipefail;


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_basename() {
  for _path in "$@"; do
    echo "${_path##*/}";
  done
}

_as_me="$( _basename "$0"; )";


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_abspath() {
  for _path in "$@"; do
    if [[ -f "$_path" ]]; then
      ( pushd "${_path%/*}" &>/dev/null; echo "$PWD"; )
    elif [[ -d "$_path" ]]; then
      ( pushd "$_path" &>/dev/null; echo "$PWD"; )
    else
      echo "$_as_me: No such file or directory '$_path'." >&2;
      return 1;
    fi
  done
}


_dirname() {
  for _path in "$@"; do
    echo "${_path%/*}";
  done
}


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_script_dir="$( _abspath "$( _dirname "$0"; )"; )";

_version="0.1.0";

_usage_msg="USAGE: $_as_me [OPTIONS...]


";

_help_msg="$_usage_msg


OPTIONS
  -h,--help         Print help message to STDOUT.
  -u,--usage        Print usage message to STDOUT.
  -v,--version      Print version information to STDOUT.

ENVIRONMENT
  GREP              Command used as \`grep' executable.
  REALPATH          Command used as \`realpath' executable.
  MKTEMP            Command used as \`mktemp' executable.
";


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usage() {
  if [[ "${1:-}" = "-f" ]]; then
    echo "$_help_msg";
  else
    echo "$_usage_msg";
  fi
}


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# @BEGIN_INJECT_UTILS@
: "${GREP:=grep}";
: "${REALPATH:=realpath}";
: "${MKTEMP:=mktemp}";


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declare -a tmp_files tmp_dirs;
tmp_files=();
tmp_dirs=();

mktmp_auto() {
  local _f;
  _f="$( $MKTEMP "$@"; )";
  case " $* " in
    *\ -d\ *|*\ --directory\ *) tmp_dirs+=( "$_f" ); ;;
    *)                          tmp_files+=( "$_f" ); ;;
  esac
  echo "$_f";
}


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cleanup() {
  rm -f "${tmp_files[@]}";
  rm -rf "${tmp_dirs[@]}";
}

_es=0;
trap '_es="$?"; cleanup; exit "$_es";' EXIT;


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while [[ "$#" -gt 0 ]]; do
  case "$1" in
    # Split short options such as `-abc' -> `-a -b -c'
    -[^-]?*)
      _arg="$1";
      declare -a _args;
      _args=();
      shift;
      _i=1;
      while [[ "$_i" -lt "${#_arg}" ]]; do
        _args+=( "-${_arg:$_i:1}" );
        _i="$(( _i + 1 ))";
      done
      set -- "${_args[@]}" "$@";
      unset _arg _args _i;
      continue;
    ;;
    --*=*)
      _arg="$1";
      shift;
      set -- "${_arg%%=*}" "${_arg#*=}" "$@";
      unset _arg;
      continue;
    ;;
    -u|--usage)    usage;    exit 0; ;;
    -h|--help)     usage -f; exit 0; ;;
    -v|--version)  echo "$_version"; exit 0; ;;
    --) shift; break; ;;
    -?|--*)
      echo "$_as_me: Unrecognized option: '$1'" >&2;
      usage -f >&2;
      exit 1;
    ;;
    *)
      echo "$_as_me: Unexpected argument(s) '$*'" >&2;
      usage -f >&2;
      exit 1;
    ;;
  esac
  shift;
done


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