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Full Discussion: Trapped in pipe
Top Forums Shell Programming and Scripting Trapped in pipe Post 302386317 by ultimatix on Tuesday 12th of January 2010 06:29:00 AM
Old 01-12-2010
Trapped in pipe
Hi

Is there any way to find out in a single step ( command) the step where the pipe command failed when using multiple commands using pipe .

eg : ll *.tar | grep dec | grep december.tar

the first step is listing all tar files . Second step constitutes piping that data and

doing grep for dec . The q/p of this cmd is fed to 3rd pipe to get the desired

result .

Now what i want to know is that in case in any of the pipe steps the command fails ( suppose it doesnt return any o/p) .. which is the step .

Pls help
 

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LEARN ABOUT PLAN9

zgrep

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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