SoylentNews

Looping in Bash: An Introduction

posted by LaminatorX on Sunday October 12 2014, @09:19AM   
from the Bad-Ass-Script-Host dept.

toygeek writes:

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/

• Re:Some details Re:Some details (Score: 3, Informative) by maxwell demon on Sunday October 12 2014, @05:11PM

  by maxwell demon (1608) on Sunday October 12 2014, @05:11PM (#105099) Journal

  Given that the $() syntax is part of POSIX, I guess unless you need to target very old systems, there's no reason to use backticks.

  Note that on some very old systems, the usual shebang line may not work either, since some old systems checked for the four-byte sequence "#! /", so they would not recognize the commonly found

  #!/bin/sh

  but only

  #! /bin/sh

  --
  The Tao of math: The numbers you can count are not the real numbers.

  Parent

  Starting Score:	1		point
  Moderation		+1
  Informative=1, Total=1
  Extra 'Informative' Modifier		0
  Karma-Bonus Modifier		+1
  Total Score:		3

• Re:Some details (Score: 1) by theCoder on Sunday October 12 2014, @09:02PM

  by theCoder (3583) on Sunday October 12 2014, @09:02PM (#105264)

  Good to know. I didn't realize support was so widespread and standard. I guess I was burned on some older (maybe Solaris 8?) machines, assumed it was a bash feature only, and never tried again.

  Parent