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Full Discussion: Reading UNIX commands from file and redirecting output to a file
Top Forums Shell Programming and Scripting Reading UNIX commands from file and redirecting output to a file Post 302538435 by clx on Wednesday 13th of July 2011 02:44:53 AM
Old 07-13-2011
Quote:
Originally Posted by rahulparo
My objective is to store the o/p of the command in a variable and do ceratin operations on it. It works fine if i just ls but not working with pipe...
If the operations are limited within the loop, you could just skip the "commands.txt" stuff.


Code:
ps -ef | grep abc | grep xyz |awk '{print $2} | while read pid
do 
  echo $pid
done

You might need to handle the variable scoping (subshell) if needed outside the loop.
 

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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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