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Re: PIPESTATUS always returns only a single element


From: Chet Ramey
Subject: Re: PIPESTATUS always returns only a single element
Date: Thu, 12 Aug 2010 20:00:32 -0400
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.11) Gecko/20100711 Lightning/1.0b1 Thunderbird/3.0.6

On 8/12/10 6:37 PM, address@hidden wrote:

> Bash Version: 4.1
> Patch Level: 7
> Release Status: release
> 
> Description:
>       PIPESTATUS never shows more than 1 array element after executing a 
> multiple command pipe
> 
> Repeat-By:
>       Execute the following script:
> 
> #!/bin/bash
> #
> # A script to test PIPESTATUS and pipefail
> #
> echo "   cmd: set +o pipefail"
> echo "  pipe: ps -ef 2>&1 | grep "^\$USR" >/dev/null"
> set +o pipefail
> ps -ef 2>&1 | grep "^$USR" >/dev/null
> echo "expect: PIPESTATUS = 1 0 \$? = 0; got: PIPESTATUS = ${PIPESTATUS[*]} 
> \$? = $?"
> echo
> echo "   cmd: set -o pipefail"
> echo "  pipe: ps -ef 2>&1 | grep "^\$USR" >/dev/null"
> set -o pipefail
> ps -ef 2>&1 | grep "^$USR" >/dev/null
> echo "expect: PIPESTATUS = 1 0 \$? = 1; got: PIPESTATUS = ${PIPESTATUS[*]} 
> \$? = $?"
> echo
> echo "  pipe: ps aux 2>&1 | grep "^\$USER" >/dev/null"
> ps aux 2>&1 | grep "^$USER" >/dev/null
> echo "expect: PIPESTATUS = 0 0 \$? = 0; got: PIPESTATUS = ${PIPESTATUS[*]} 
> \$? = $?"
> echo "expect: PIPESTATUS = 0 \$? = 0; got: PIPESTATUS = ${PIPESTATUS[*]} \$? 
> = $?"
> #
> # End of script
> 
> None of the 'got' results 'expect'ing multiple PIPESTATUS results work.

Interesting.  I can't reproduce it.

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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