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Be sure to use strict; and use warnings;—they will catch bugs in your code so you don't have to.
Yeah, but it doesn't actually help catching the bug the OP is struggling with, does it?
Bare filehandles ("FH") are discouraged. Use open(my $fh, "<", $tu), three-argument open.
Bollocks. There's nothing wrong with the filehandle or the open the OP used.

In reply to Re^2: substitute 4 spaces instead of a tab by JavaFan
in thread substitute 4 spaces instead of a tab by bluetooth

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