Replace $line with whatever variable you are storing the line in. (In this case, $_)

Also, you should probably print the modified lines to the output file at some point inside the loop.

PS: use warnings; use strict;, and opens in the form of open my $filehandle, '<', $filename or die "I couldn't open the file.  OS says: $!"; will help highlight likely mistakes in your code and illuminate the reasons for any file errors.

In reply to Re^3: How to have perl check line length by SuicideJunkie
in thread How to have perl check line length by ddrew78

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