$ perl -lp000e1  input.txt >output.txt

##</code><code>##

$ perl -MO=Deparse -lp000e1

BEGIN { $/ = ""; $\ = "\n"; }
LINE: while (defined($_ = readline ARGV)) {
    chomp $_;
    '???';
}
continue {
    die "-p destination: $!\n" unless print $_;
}

##</code><code>##

use warnings;
use strict;

local ($/,$\) = ("","\n");
while (<>) {
    chomp;
    print;
}