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Re: $? in the right side of a pipe


From: Chet Ramey
Subject: Re: $? in the right side of a pipe
Date: Mon, 06 Sep 2010 19:47:20 -0400
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On 9/5/10 5:36 AM, Pierre Gaston wrote:
> using the following:
> 
> false; : | echo $?
> 
> bash and ksh93 print 0
> pdksh, dash and zsh print 1

It looks like bash and ksh93 wait for each command in a pipeline to finish
and allow the intermediate commands to set $?, which, depending on timing,
can be seen by subsequent commands in the pipeline.  The other shells must
do something different.

Chet


-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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