You can also save some typing where you build your @array from the MSG file handle. Your
foreach $line (<MSG>) {
chomp($line);
push(@array, $line);
could be written
chomp( @array = <MSG> );
It is good practice to put
use strict;
use warnings;
at the top of your scripts to enforce a little coding discipline and catch typos. It is also good practice to use lexical file handles, the three-argument form of open and to check that it succeeded (you do this), but also give the o/s error (see $! in perlvar) to give a better idea of why it failed.
open my $msgFH, q{<}, q{/some/file}
or die qq{open: < /some/file: $!\n};
I hope these points are helpful.
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