bash scripting

#!/usr/bin/env bash

set -Eeuo pipefail

cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1

trap cleanup SIGINT SIGTERM ERR EXIT

usage() {
  cat <<EOF
Usage: $(basename "$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
}

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

setup_colors() {
  if [ -t 2 ](/--t-2-.html){.wikilink} && [ -z "${NO_COLOR-}" ](/--z-"${NO_COLOR-}"-.html){.wikilink} && [ "${TERM-}" != "dumb" ](/-"${TERM-}"-!=-"dumb"-.html){.wikilink}; then
    NOCOLOR='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
  else
    NOCOLOR='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
  fi
}

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 "${1-}" in
    -h | --help)
      usage
      ;;
    -v | --verbose)
      set -x
      ;;
    --no-color)
      NO_COLOR=1
      ;;
    -f | --flag) # example flag
      flag=1
      ;;
    -p | --param) # example named parameter
      param="${2-}"
      shift
      ;;
    -?*)
      die "Unknown option: $1"
      ;;
    *)
      break
      ;;
    esac
    shift
  done

  args=("$@")

  # check required params and arguments
  [ -z "${param-}" ](/--z-"${param-}"-.html){.wikilink} && die "Missing required parameter: param"
  [ ${#args[@]} -eq 0 ](/-${#args[@]}--eq-0-.html){.wikilink} && die "Missing script arguments"

  return 0
}

parse_params "$@"
setup_colors

# script logic here

msg "${RED}Read parameters:${NOCOLOR}"
msg "- flag: ${flag}"
msg "- param: ${param}"
msg "- arguments: ${args[*]-}"