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Full Discussion: broken pipe
Top Forums UNIX for Dummies Questions & Answers broken pipe Post 302574021 by fhew on Wednesday 16th of November 2011 09:33:22 AM
Old 11-16-2011
broken pipe

I know what causes 'broken pipe' errors, but I can't understand why I can get it (only occasionally) with my example:

Code:
ps -ef | grep "\./ans$" | grep -v grep

Basically I'm searching the ps output looking for the process I'm interested in and excluding the process that is grepping for the answer.

Actually I'm doing all this inside a perl one liner shown below:

Code:
perl -e '$_=`ps -ef | grep \"\./ans$\" | grep -v grep`; ($_)=(split(" "))[1]; kill TERM, $_ if $_;'

Very infrequently it fails, but of course I need it to 'never' fail!

If the cause is 'a process writing into a closed pipe', it can happen in two places, but I can't fathom why either the 2nd grep would close the pipe on the first one, or that the first grep would close the pipe on the 'ps'.

I would expect the ps to send and EOF and close the pipe on the first grep who would in turn close the pipe on the second grep.

Can anyone explain my dilema?

TIA
Fulko
Moderator's Comments:
Mod Comment Please use code tags!

Last edited by vbe; 11-16-2011 at 10:41 AM.. Reason: code tags rm fonts
 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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