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Full Discussion: If user input matches file contents
Top Forums UNIX for Dummies Questions & Answers If user input matches file contents Post 302759527 by Yoda on Tuesday 22nd of January 2013 12:31:32 PM
Old 01-22-2013
One way to achieve this is using grep command:
Code:
echo "Enter your username:"
read username
if [[ $( grep -c "$username" userlist.txt ) -ne 0 ]]; then
   echo "You may proceed"
else
   echo "You are not authorized"
   exit 1
fi

 

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LEARN ABOUT HPUX

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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