Given below is a perl script which compares one column from one file and checks with a key if it exists in another file and exists in file2. 
use strict;
use warnings;
use Data::Dumper;
my ($file1 ,$file2,$file3)= @ARGV;

open(my $fh, '>', $file3) or die $!;

#reading file1 into a hash

my %hash;
my @fields;
open( my $fh1, '<', $file1 ) or die $!;
while ( my $line = <$fh1> ) {
    chomp $line;

    next if $line =~ /^\s*$/;
    $line =~ s/^\s+|\s+$//g;
    $hash{$line} = 1;
}

#print Dumper(\%hash);

close $fh1;

open( my ($fh2), $file2 ) or die $!;

while ( my $row = <$fh2> ) {
    chomp $row;

    #print "$row\n";
    next if $row =~ /^\s*$/;
    $row =~ s/^\s+|\s+$//g;
    my (@fields) = split( /\|/, $row );

   # print "$fields[0]\n ";

    if ( exists $hash{ $fields[0] } ) {
        print $fh  "$row\n";
    }
}
close $fh;
close $fh2;

[download]
Now i want it to be able to compare with N number of columns like file 1 having more than 1 columns. What modifications are to be done in this ? The need is to generalize the script and make it a compare utility. Kindly guide
SO basically These are the files
File1
L| D
L| C
L| C
File2
AE|A|D||
A|A|P| |
A|A|P| |
A|A|P| |
So if i pass Col2 from file1 as parameter and Col3 from file2 as second the output should be
AE|A|D||
Since this contains the column2 value from file1 in its column3

In reply to Comparision Utility PERL by vighneshmufc

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