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To:Speakup is a screen review system for Linux. From:Ari Moisio Subject:Re: ot, bash programming question Date:Thu, 29 Mar 2012 10:16:12 +0300 (EEST)
 

Hi Greg

I'm not sure what you lookin for but simpliest way is jsut to have the
command after the if verb:

if true
then ...
or
if ls *
then # true if there are any files

You can also ask the $? after command execution
/path/to/command
if test $? -q 1
then ....

or use case to handle differrent values
/path/to/command
case $?
in
0) # success
...
;;
1) # minor failure
...
...
esac

HTH




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Gregory Nowak kirjoitti> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi folks,
>
> apologies for the off topic post, but I'm hoping someone can answer my
> question.
>
> In a bash script, how do you deal with a program returning 0 in an if
> statement?
> Here's a script to illustrate what I mean
>
> #!/bin/sh
> if [ `/bin/true || echo $?` = 1 ] ; then
> echo "returned 1"
> fi
>
> When I run this, I should just get the bash prompt back. When I run it
> though, I get:
>
> [: 4: =: unexpected operator
>
> followed by the prompt.
> I understand this happens because true exits with 0 status, and it
> isn't echoed back, so the if statement compares nothing to 1. What I'd
> like to know is how to get around that? Thanks in advance.
>
> Greg
>
>
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