Presuming this question is asking for a little more than the answer you get when you type:
ls perl5/Tk/*.pm
there is a way to find out what gets EXPORTED by Tk.pm. Use a script like:
#!/usr/bin/perl
use Tk;
require 'dumpvar.pl';
dumpvar('Tk');
or more succintly at the shell command prompt:
perl -e 'use Tk; require "dumpvar.pl"; dumpvar("Tk");'
The advantage of using dumpvar over ls is that it
gives you a brief summary of all the arguments your widgets want.
Note that the output is many lines and you may wish to pipe through
more or less.
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