open(my $in_file,'<', ...) or die "Can not open ... for writing: $!.\n";

<nit>
$in_file is being opened for reading ('<'), not writing.
</nit>

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: While loop not printing anything after using grep by AnomalousMonk
in thread While loop not printing anything after using grep by skjeiu

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