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Re: How to inherent non-zero exit status using pipe?


From: Eric Blake
Subject: Re: How to inherent non-zero exit status using pipe?
Date: Wed, 11 Aug 2010 07:53:18 -0600
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On 08/11/2010 07:46 AM, Eric Blake wrote:
> On 08/11/2010 05:20 AM, Pierre Gaston wrote:
>> On Wed, Aug 11, 2010 at 2:18 PM, Peng Yu <address@hidden> wrote:
>>> Hi,
>>>
>>>
>>> The following example returns the exit status of the last command in a
>>> pipe. I'm wondering if there is a way to inherent non-zero exit status
>>> using pipe. That is, if there is any command in a pipe that return a
>>> non-zero status, I'd like the whole pipe return a non-zero status.
>>
>> set -o pipefail
> 
> But be aware that you seldom want to use this globally

A less invasive technique is to inspect the array variable
address@hidden, which bash maintains for all elements of the previous
pipeline.  But remember, both pipefail and $PIPESTATUS are bash
extensions, and not pure POSIX.

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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