So I added it like below to my script, but it doesn't work. Am I missing something else? 
open(NPBXNUM1, ">npbxnum1");
open(MYINPUTFILE, "npbxnum");

while (<MYINPUTFILE>) {
chomp;
$line .= '_' x (4 - length $line);
}

close(MYINPUTFILE);
close(NPBXNUM1);

system "mv npbxnum1 npbxnum";

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In reply to Re^2: How to have perl check line length by ddrew78
in thread How to have perl check line length by ddrew78

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