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Full Discussion: Testing for exit status
Top Forums UNIX for Dummies Questions & Answers Testing for exit status Post 15675 by Perderabo on Monday 18th of February 2002 01:05:30 PM
Old 02-18-2002
A command like:
grep string < file
finds the lines that match string in file. You are setting your "a" variable to all those lines. And the result of the grep will never be a "0" since the string you are searching for is not "0". If nothing matches the string, grep doesn't print a 0. It prints nothing at all. In that case the "a" variable is empty and still won't match "0".

Try piping the grep to "wc -l" so that you set "a" to a count of the lines.
 

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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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