#!/usr/bin/env bash

set -o pipefail

# ...

Bash Strict Mode:

• set -o errexit - halt on error
• set -o nounset - halt if variable is unset
• set -o pipefail - halt if command inside pipe failed

Bash ENV interpolations

• "$FOO"
• "${FOO}"
• set -u raise error for undefined referenced variable

String in Bash

Double Quotes