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Re: PIPESTATUS inconsistent behavior in 3.0


From: Chet Ramey
Subject: Re: PIPESTATUS inconsistent behavior in 3.0
Date: Thu, 11 Aug 2005 11:07:07 -0400
User-agent: Mozilla Thunderbird 1.0.6 (Macintosh/20050716)

Frank Wang wrote:

> Machine Type: i386-redhat-linux-gnu
> 
> Bash Version: 3.0
> Patch Level: 16
> Release Status: release
> 
> Description:
>         Here is what I got from my fc4 box.
> address@hidden ~]$ echo $BASH_VERSION
> 3.00.16(1)-release
> address@hidden ~]$ ls | bogus_command | wc
>       0       0       0
> address@hidden ~]$ echo address@hidden
> 141 127 0

This is not a bug.  The exit status of `ls' can vary, depending on
whether or not it's killed by SIGPIPE or manages to write all of its
output before exiting.  When it's killed by SIGPIPE -- writing to a
pipe with no reader -- the exit status is 141.  When it completes
writing its output, the exit status will be 0.  The same goes for
`tr'.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )
                                                Live...Laugh...Love
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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