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Full Discussion: diaplaying the grep result
Top Forums Shell Programming and Scripting diaplaying the grep result Post 302179092 by era on Thursday 27th of March 2008 02:37:41 AM
Old 03-27-2008
The syntax of the assignment is all wrong. But you can avoid running the thing twice. This is one of the few situations where really you want to execute a command first, and then examine its exit code in $?

Code:
temp=`swlist -a revision 2>/dev/null | grep ABC` # note backticks, not regular quotes
case $? in 0) # grep succeeded, meaning it was found
    echo Found $temp ABC version, please remove it first ... >&2 ;;
esac

I took the liberty of removing the 2>/dev/null from grep, because I don't see how it could produce an error.
Last edited by era; 03-27-2008 at 03:39 AM.. Reason: Had inverted the success condition, oops
 

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LEARN ABOUT POSIX

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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