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Re: exit status issue

From: DJ Mills
Subject: Re: exit status issue
Date: Fri, 18 Nov 2011 15:15:13 -0500

On Fri, Nov 18, 2011 at 2:59 PM, Bob Proulx <address@hidden> wrote:
> Dallas Clement wrote:
>> Geir Hauge wrote:
>> > Add ''set -x'' at the start of the function and examine the output
>> > to see if it actually runs touch from PATH.
>> The strace output is showing that the correct 'touch' is being executed.
> It would be a lot easier to use the 'sh -x' trace than using strace
> for seeing what is going on in your script.  Try it first and see
> commands are being run.  Because you are setting CHK_RESULT=1 as a
> default all that it would take for your script to exit 1 would be to
> not be setting that value to zero at a time that you think it should.
>  sh -x ./scripttodebug
> Your script is complicated enough that it isn't immediately obvious by
> a casual inspection whether it is correct or not.  Almost certainly in
> these cases it is an error in the programming of the script.  I would
> much sooner suspect it than bash at this point.
>>        TMP=`grep $1 /proc/mounts|awk '{print $1}'`
> You do not show how this is called but $1 option argument to grep may
> be insufficiently quoted.
>>    echo "*** fsaccesstest failed to unmount $1. ***" >/dev/console
> Writing directly to /dev/console is a little harsh.  You might
> consider using the 'logger' program and writing to the syslog instead.
> Your script makes me think that you might be using an NFS automounter
> and trying to correct nfs client problems.  (shrug)
> Bob

I'm guessing you mean bash -x, not sh -x.  Two different shells.

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