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 Forum index » Off-Topic Area » Programming
A Bash programming question [solved]
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scsijon

Joined: 23 May 2007
Posts: 923
Location: the australian mallee
PostPosted: Wed 11 Apr 2012, 02:21    Post subject:  A Bash programming question [solved]  
Beginner, don't yell please! I have looked at and downloaded a number of the bash tutorials and have a lot of unanswered questions still.

I'm trying to sort out Barry's mageia2ppm to handle a number of possibilities for a field in the one list as it's changed in mageia2 where files in the file lists can now have an inclusion of:
mga1, still used mageia 1 files,
mga2, new mageia2 compiled files,
or mgac, the talked about Mageia 'cauldron' file directory, which is their "here be dragons" level files. Currently mageia 2 beta lives there!

Task Problem No1.

I want to setup the following

Variable MAGEIA_VERSION = '1' or '2' or 'c' (the digits 1, 2, or the lowercase letter c) only.

so it should look like?

Code:

#!/bin/bash

MAGEIA_VERSION= 1||2||c



that doesn't look right?

Can I have some guidance please![/code]
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Last edited by scsijon on Sat 14 Apr 2012, 20:52; edited 1 time in total
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dawg

Joined: 09 Aug 2009
Posts: 106
Location: still here
PostPosted: Wed 11 Apr 2012, 09:06    Post subject:  
I'm guessing you're also new to programming in general. Smile And I don't think Bash is a good "first" programming language, but since you're at it, you may want to look into arrays.

Anyway, I'm not a Bash expert, I'm sure others will be able to offer more efficient help in learning how to do what you wanna do with it. I wish you all the best on your journey! Smile
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chromoite


Joined: 02 Apr 2012
Posts: 40
PostPosted: Wed 11 Apr 2012, 16:55    Post subject:  
Learn BASH scripting
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seaside

Joined: 11 Apr 2007
Posts: 833
PostPosted: Wed 11 Apr 2012, 17:16    Post subject:  
scsijon,

Several possibilities - here's two....

Code:
if grep -Eq  '1|2|c'  <<<$MAGEIA_VERSION; then echo ok; fi

And-

 case $MAGEIA_VERSION  in   -1|2|c) echo ok  ;;  esac



Cheers,
s
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Thu 12 Apr 2012, 01:42    Post subject:  
Code:
case "$MAGEIAVERSION" in
  1)v1_function;;
  2)v2_function;;
  c)vc_function;;
  *)echo "$MAGEIAVERSION" not supported && exit;;
esac
or if they are all use the same function you can simply
Code:
case "$MAGEIAVERSION" in
  1|2|c)the_function;;
  *)echo "$MAGEIAVERSION" not supported && exit;;
esac

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Moose On The Loose


Joined: 24 Feb 2011
Posts: 278
PostPosted: Thu 12 Apr 2012, 21:25    Post subject:  
technosaurus wrote:
Code:
case "$MAGEIAVERSION" in
  1)v1_function;;
  2)v2_function;;
  c)vc_function;;
  *)echo "$MAGEIAVERSION" not supported && exit;;
esac
or if they are all use the same function you can simply
Code:
case "$MAGEIAVERSION" in
  1|2|c)the_function;;
  *)echo "$MAGEIAVERSION" not supported && exit;;
esac


how about
Code:

  1|2|c)v${MAGEIAVERSION}_function;;
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scsijon

Joined: 23 May 2007
Posts: 923
Location: the australian mallee
PostPosted: Fri 13 Apr 2012, 22:32    Post subject:  
no, dawg, just little use for a decade or two down at this level! Use to do everything by scripting back in the '70's and 80's. Brain doesn't get used with information, information gets lost or overwritten!

Perfecto technosaurus, that first bit of code should deal with two problems at once, thanks. I'm trying to sort out the mageia2ppm file converter problem (t=75739 and t=56867) as it will become a major problem soon as mageia2 is due out as release on 14th May. I'm using it for qtpuppy!

thanks to all
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