Minimal safe Bash script template - see the article with full description: https://betterdev.blog/minimal-safe-bash-script-template/

bash-template.sh

#!/bin/bash

set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

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

usage() {
  local code=${1-0} # specify exit code when used as alternative to die()
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

Script description here.

Available options:

-h, --help      Print this help and exit
-v, --verbose   Print script debug info
-f, --flag      Some flag description
-p, --param     Some param description
EOF
  exit "$code"
}

cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
  # script cleanup here
}

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

die() {
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
}

parse_params() {
  # default values of variables set from params
  FLAG=0
  PARAM=''

  while :; do
    case "${1-}" in
    -h | --help) usage ;;
    -v | --verbose) set -x ;;
    -f | --flag) FLAG=1 ;; # example flag
    -p | --param) # example named parameter
      PARAM="${2-}"
      shift
      ;;
    -?*) msg "Unknown option: $1" && usage 1;;
    *) break ;;
    esac
    shift
  done

  ARGS=("$@")

  # check required params and arguments
  [[ -z "${PARAM-}" ]] && msg "Missing required parameter: param" && usage 1
  [[ ${#ARGS[@]} -eq 0 ]] && msg "Missing script arguments" && usage 1

  return 0
}

parse_params "$@"

# script logic here

msg "Read parameters:"
msg "- flag: ${FLAG}"
msg "- param: ${PARAM}"
msg "- arguments: ${ARGS[*]-}"