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Liam Hammett explains how you can use the trap command to stop multiple bash process in one go.

Sometimes when working on a project, I’ll always want to run a handful of commands at the same time, some of which may return when they’re done, others might be long-running, like watchers or services actively exposing ports. This is something that might seem simple to do with a basic Bash script at first, but what if your script has multiple processes running side-by-side and you want to be able to stop them all at once too?

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In a post on his site Mattias Geniar shares how to write for loops in Bash.

Let me first start by saying something embarrassing. For the first 4 or 5 years of my Linux career -- which is nearing 10 years of professional experience -- I never used loops in Bash scripts. Or at the command line.

The thing is, I was a very fast mouse-clicker. And a very fast copy/paster. And a good search & replacer in vim and other text editors. Quite often, that got me to a working solution faster than working out the quirky syntax, testing, bugfixing, ... of loops in Bash.

And, to be completely honest, if you're managing just a couple of servers, I think you can get away with not using loops in Bash. But, once you master it, you'll wonder why you haven't learned Bash for-loops sooner.

https://ma.ttias.be/bash-loop-first-step-automation-linux/

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