in reply to Delete Duplicate Entry in a text file

Assuming you've opened $fh for reading on your fail.txt file or whatever, it should be about as easy as.... 

my $last;
while (my $line = <$fh>) {
    next if defined $last and $line eq $last;
    print $line;
    $last = $line;
}

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You'll have to modify it a bit for those blank lines, if they really appear in your log files.

Edit: added my $line = to while loop.

-sauoq
"My two cents aren't worth a dime.";

In Section Seekers of Perl Wisdom