안전한 Bash 스크립트 템플릿

#!/usr/bin/env bash
set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]
EOF
  exit
}

cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
}

setup_colors() {
  if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
    NOFORMAT='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m'
  else
    NOFORMAT='' RED='' GREEN=''
  fi
}

msg() { echo >&2 -e "${1-}"; }
die() { msg "$1"; exit "${2-1}"; }

parse_params() {
  flag=0; param=''
  while :; do
    case "${1-}" in
      -h|--help) usage ;;
      -v|--verbose) set -x ;;
      --no-color) NO_COLOR=1 ;;
      -f|--flag) flag=1 ;;
      -p|--param) param="${2-}"; shift ;;
      -?*) die "Unknown option: $1" ;;
      *) break ;;
    esac
    shift
  done
  args=("$@")
  [[ -z "${param-}" ]] && die "Missing required parameter: param"
  [[ ${#args[@]} -eq 0 ]] && die "Missing script arguments"
}

parse_params "$@"
setup_colors
# script logic here

핵심: set -Eeuo pipefail, trap cleanup, script_dir, stderr용 msg().