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Top Forums Shell Programming and Scripting Having trouble greping a variable Post 302625781 by itkamaraj on Wednesday 18th of April 2012 09:22:16 AM
Old 04-18-2012
Code:
 
echo Username
read username
grep $username register.txt > /dev/null 2>&1
if [ "$?" -eq "0" ]; then
echo Login successful.
else
echo Failed to login.
fi

$? is a speacial variable which holds the exit code of the previous command.

so, if the grep is success, then it is 0 otherwise not zero
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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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