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Full Discussion: Find duplicate value and create an
Top Forums Shell Programming and Scripting Find duplicate value and create an Post 302170477 by matt.d on Monday 25th of February 2008 05:21:00 PM
Old 02-25-2008
It's a start...
I got some of the IP address part of it. Having trouble with the host part. See if this helps any:

Code:
#!/usr/bin/perl

# find duplicate entries in /etc/hosts

print "\nDUPLICATE IP ADDRESSES\n";
print "----------------------\n";

foreach (@ips=`grep -E '^[0-9]' /etc/hosts | cut -f1`) {
        chomp(@ips);
        $count = `grep -c $_ /etc/hosts`;

        if ($count > 1) {
                print "$_\n";
        }
}

 

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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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