Try

#!/usr/bin/perl
use strict;
use warnings;

my @file = ('tst1.txt','tst2.txt');
my %compare = ();

# inputs
for my $n (0..$#file){
  parse_file($n);
}

# output diff
for my $segment (sort keys %compare){
  for my $row (sort keys %{$compare{$segment}}){
    my $rec = $compare{$segment}{$row}; 
    if (defined $rec->[0] && defined $rec->[1]){
      # matched
    } else {
      printf "%s %s\n",$segment,$row;
    }
  }
}


sub parse_file {
  my ($n) = @_;
  my $filename = $file[$n]; 
  my $segment;
  open IN,'<', $filename 
    or die "Could not open $filename : $!";
  while (<IN>){
    s/\s+$//; # trim trailing whitespace
    if (s/^\s+//){
      ++$compare{$segment}{$_}[$n];
    } else {
      $segment = $_;
    }  
  }
  close IN;
}

[download]
poj

In reply to Re^5: Need to have perl script to compare two txt files and print difference along with under which segment the difference is by poj
in thread Need to have perl script to compare two txt files and print difference along with under which segment the difference is by User_04271983

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