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Full Discussion: Shell Script If Else problem!
Top Forums Shell Programming and Scripting Shell Script If Else problem! Post 302539289 by kshji on Saturday 16th of July 2011 08:56:51 AM
Old 07-16-2011
grep look from file. Exit status is 0 if founded and not 0, if not. Output of grep is not interesting.
Code:
if grep "$input"  File.txt   >/dev/null  2>&1
then
    echo "Found"
else 
    echo "Not found!"
fi

If you like to use while, then ex.
Code:
while read line
do
        data=${line/$input/}
        [ "$data" != "$line" ] && echo "found" && exit 0
done < File.txt
echo "not found"
exit 1

 

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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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