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Full Discussion: returning status of a command
Top Forums Shell Programming and Scripting returning status of a command Post 302436490 by methyl on Monday 12th of July 2010 07:09:51 AM
Old 07-12-2010
Assuming we have a file called "file_which_does_exist" and we do not have a file called "file_which_does_not_exist" and we are looking for a string "string". There are three possible reply codes.

Code:
grep -qs "string" file_which_does_not_exist; REPLY="$?"
echo "${REPLY}"
2

grep -qs "rubbish" file_which_does_exist; REPLY="$?"
echo "${REPLY}"
1

grep -qs "string" file_which_does_exist; REPLY="$?"
echo "${REPLY}"
0

This User Gave Thanks to methyl For This Post:
biglau
 

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LEARN ABOUT XFREE86

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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