Monks:

Please I need your help with the attached script (below). I am trying to compare two files (f1.txt, f2.txt) and output data that is not present in f1.txt but present in f2.txt to an output file -of.txt. 

==> f1.txt <==
Francis
Josh
Matt
Sean

==> f2.txt <==
Francis
Sean
Matt
Martine
Josh

==> of.txt <==
Martine

[download]

The attached script(below) work just fine. The problem that i have is how do I update my script to achieve the following result below. I know I can use regular expression but I have been unsuccessful. 

==> f1.txt <==
Francis
Josh
Matt
Sean

==> f2.txt <==
FrancisApp1 application program
Sean128 name number
Matt Po125 Hai
Martine
Josh393 daily

==> of.txt <==
Martine

[download]

I look forward to hearing from you. Thanks, Francis 


#Program: compareTwoFiles.pl
#The program compares two files and output the data in File2(f2.txt)
#that is not present in File1(f1.txt) into OUTFILE(ot.txt)

#!/usr/bin/perl

use strict;
use warnings;

#declaration of variables
my $file1 = '/opt/programming/work/f1.txt';
my $file2 = '/opt/programming/work/f2.txt';
my $outfile = '/opt/programming/work/of.txt';
my %results = ();

open FILE1, "$file1" or die "Could not open file: $! \n";
while (my $line = <FILE1>){
        chomp($line);
        $results{$line} = 1;
}
close (FILE1);

open (OUTFILE, ">$outfile") or die "Cannot open $outfile for writing: 
+$! \n";
        open FILE2, "$file2" or die "Could not open file: $! \n";
          while (my $line = <FILE2>){
                chomp($line);
                print (OUTFILE $line, "\n") unless defined($results{$l
+ine});
          }

        close (FILE2);
close (OUTFILE);

[download]

In reply to compare two files | Help by fnicholas

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