Contents returns the contents of a Text widget as a string. \n is used to seperate lines so the following should get you what you want:
...
$frame_2->Button(
-text => 'Print', -width=>7, -command=>\&doPrint
)->pack(-side =>'bottom');
MainLoop;
sub doPrint {
my @lines = split /\n/, $scroll->Contents ();
print join "\n", @lines;
}
DWIM is Perl's answer to Gödel
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