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deltamalloc
Apprentice
Joined: 18 Jan 2013
Posts: 279
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 Posted: Fri Jul 12, 2013 9:59 pm Post subject: BASH script fails to run on Gentoo but not other systems |
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I have a script I wrote myself that works on other systems, e.g. standard Slackware, but fails on Gentoo.
I remember something similar from a distro that didn't really use bash, bash was just a symlink to something else. But on my Gentoo system /bin/bash is the real bash (at least it is not a symlink). What could it be that makes the script fail to run?
The line that fails is:
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if [ $IP == ${hosts[$i]} ]; then
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This fails with:
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[: ==: unary operator expected
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666threesixes666
Veteran
Joined: 31 May 2011
Posts: 1248
Location: 42.68n 85.41w
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| Posted: Fri Jul 12, 2013 10:25 pm Post subject: |
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post the entire script?
mkultra@mksrv ~ $ echo $IP
mkultra@mksrv ~ $ echo ${hosts[$i]}
unset in my OS. |
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Aiken
Apprentice
Joined: 22 Jan 2003
Posts: 239
Location: Toowoomba/Australia
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| Posted: Sat Jul 13, 2013 12:12 am Post subject: |
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I would be tempted to put
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echo $IP $i ${hosts[$i]}
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before the if to see if the 3 variables are set. The error message has me thinking 1 of the variables is not set.
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#!/bin/bash
IP="172.16.31.1"
hosts[1]="172.16.31.1"
hosts[2]="172.16.31.2"
i=1
echo $IP $i ${hosts[$i]}
if [ $IP == ${hosts[$i]} ]; then echo found; fi
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works for me but if for example IP is not set then I get the same error message as you do. Same error if i is out of range so hosts[i] is not set.
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666threesixes666
Veteran
Joined: 31 May 2011
Posts: 1248
Location: 42.68n 85.41w
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| Posted: Sat Jul 13, 2013 12:59 am Post subject: |
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ok... and what does your slackware box say about
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echo $IP && echo ${hosts[$i]}
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under the user that it works? (awww snap slackware supporting gentoo) |
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John R. Graham
Administrator
Joined: 08 Mar 2005
Posts: 10587
Location: Somewhere over Atlanta, Georgia
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| Posted: Sat Jul 13, 2013 1:26 am Post subject: Re: BASH script fails to run on Gentoo but not other systems |
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| deltamalloc wrote: | | Code: |
if [ $IP == ${hosts[$i]} ]; then
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This fails with:
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[: ==: unary operator expected
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If you quoted those variables properly, then the syntax error would never occur, regardless of whether or not they exist. Bad form not to quote 'em.
- John
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I can confirm that I have received between 0 and 499 National Security Letters. |
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