bash script template

template.sh

#!/usr/bin/env bash

# Copy this entire thing at the beginning of all your bash scripts,
# this will save you a lot of trouble now and in the future.

# -e: Fail on errors
# -u: Fail on undeclared/unbound variables
set -eu

# This is the directory where this script is.
# Use this to write scripts which work in directory-independent way
# so the users can start them from whereever.
ROOT_DIR="$(cd $(dirname ${BASH_SOURCE}) && pwd)"

# The rest of your script here...
# Remember, if you invoke script directly like /tmp/foo.sh it needs
# to be marked executable like `chmod +x /tmp/foo.sh`.
# Might be better to run it with `bash /tmp/foo.sh` to avoid doing this executable thing.