Basic script template for every bash script

All credits to this post

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

#/ Usage:
#/ Description:
#/ Examples:
#/ Options:
#/   --help: Display this help message
usage() { grep '^#/' "$0" | cut -c4- ; exit 0 ; }
expr "$*" : ".*--help" > /dev/null && usage

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() {
    # Remove temporary files
    # Restart services
    # ...
}

# Parse Parameters #
while [ "$#" -gt 1 ];
  do
  key="$1"

  case $key in
      -d|--discovery)
      discovery_period="$2" # EXAMPLE
      shift
      ;;
      --default)
      default=YES
      ;;
    *)
    ;;
  esac
  shift
done

if [[ "${BASH_SOURCE[0]}" = "$0" ]]; then
    trap cleanup EXIT
    # Script goes here
    # ...
fi