Use Bash Strict Mode (Unless You Love Debugging)
Let’s start with the punchline. Your bash scripts will be more robust, reliable and maintainable if you start them like this:
1#!/bin/bash set -euo pipefail IFS=$'\n\t'I call this the unofficial bash strict mode. This causes bash to behave in a way that makes many classes of subtle bugs impossible. You’ll spend much less time debugging, and also avoid having unexpected complications in production.
There is a short-term downside: these settings make certain common bash idioms harder to work with. Most have simple workarounds, detailed below: jump to Issues & Solutions. But first, let’s look at what these obscure lines actually do.
http://redsymbol.net/articles/unofficial-bash-strict-mode/
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