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When I first learned about Linux in the 90’s, I read that it was possible to even write your own commands to use at the command line. Later I learned about bash scripting, and it wasn’t long before I needed to learn how to loop in bash. Looping in bash is one of the fundamental building blocks of bash programming. It isn’t hard to do at all and is worth learning. The main reason to learn looping in bash is to handle doing the same thing over and over again. They’re easy to do even at the command line. Please follow along as we look a couple of basic examples, and how you can expand on them.
http://www.tidbitsfortechs.com/2014/10/looping-in-bash/
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(Score: 2) by ticho on Sunday October 12 2014, @10:42AM
I might be remembering this wrong, but aren't backticks considered obsolete, and to-be-replaced by $(code) construct?
(Score: 2) by tynin on Sunday October 12 2014, @10:51AM
Yeah backticks and also seq are considered obsolete but continue to work. But having used them for so long my fingers kept typing them out for doing for loops for cluster management (e.g. for x in `seq 200`; do ssh 10.0.0.$x "hostname"; done). You save yourself having to type a couple extra characters, granted not many. Only recently did one of my coworkers write this simple yet powerful parallel ssh tool that I've stopped bothering with for loops.