Sane Shell Scripting Skeleton

sane-shell-script.bash

#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'


readonly LOG_FILE="/tmp/$(basename "$0").log"
info()    { echo "[INFO]    $@" | tee -a "$LOG_FILE" >&2 ; }
warning() { echo "[WARNING] $@" | tee -a "$LOG_FILE" >&2 ; }
error()   { echo "[ERROR]   $@" | tee -a "$LOG_FILE" >&2 ; }
fatal()   { echo "[FATAL]   $@" | tee -a "$LOG_FILE" >&2 ; exit 1 ; }

cleanup() {
  echo "done cleanup"
}

add() {
  local a=${1:-0}
  local b=${2:-0}
  echo $(( a + b ))
}

main() {
  local dir=${1:-"/var/www"}
}

if [[ "${BASH_SOURCE[0]}" = "$0" ]]; then
  trap cleanup EXIT
  main "$@"
fi