I am new to Perl and trying to compare two files and print out the differences of file #2 base from file 1. In other words, I want the keep the file 1 and delete the duplicate of file 2. Each file has sections and in each section contents different information. I want to diff the files. If there are sections. Here is my code

File1.txt

SECTION, ONE, 1, 4, YELLOW, HIGH, THIS IS COMMENT
This is my line
This is my page

SECTION, THREE, 9, 4, RED, HIGH, THIS IS COMMENT
This is a dog
This is a cat
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File2.txt

SECTION, ONE, 1, 4, YELLOW, HIGH, THIS IS COMMENT
This is a cat
This is not a cat


SECTION, TWO, 2, 4, BLUE, HIGH, THIS IS COMMENT
This is not a book
This is a notebook
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SECTION, TWO, 2, 4, BLUE, HIGH, THIS IS COMMENT
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SECTION, TWO, 2, 4, BLUE, HIGH, THIS IS COMMENT
This is not a book
This is a notebook
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#!/bin/perl -w

use strict;
use warnings;
use File::Copy;
use Cwd;
my $dir = cwd;
main();
sub main
{
    printf "\nStarting script\n";
    printf "\nEnter the file 1: ";
    my $fh1 = <STDIN>;
    chomp $fh1;
    printf "\n";
    printf "Enter the file 2: ";
    my $fh2 = <STDIN>;
    chomp $fh2;
    my $tempFile = "temp.txt";
    my $nonMatch = "nonMatch.txt";
    
        if(-e $fh1 and -e $fh2) 
        {
            my %results = (); 
            open (FILE1, "<$fh1") or die "Input file $fh1 not found.\n
+";
            while(my $line = < FILE1>)
            {           
                if($line =~ /^Section/)
                {
                    my ($sec, $first, $second, $third, $color, $mode, 
+$description_comments) = split(',', $line, 7);
                                        $results{$line}=1;
                }
               }
            close(FILE1); 
            open (FILE, "<$fh2") or die "Input file $fh2 not found.\n"
+;
            while(my $line = <>) 
            { 
                if($line =~ /^Section/)
                {
                    my ($sec, $first, $second, $third, $color, $mode, 
+$description_comments) = split(',', $line, 7);
                              
                    $results{$line}++;
                }
                            }    
            
            close(FILE2);  
            open (NONMATCH, ">$nonMatch") or die "Cannot open $nonMatc
+h for writing \n";
            foreach my $line (keys %results) 
            {
             print NONMATCH " $results{$line} - $line" if $results{$li
+ne} ==2;
              }
            close NONMATCH;
            }
                            
            close FILE2;
}
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