How to repeat the execution of a function with Perl Tk

Hi,

I have just finished writing a Perl/Tk program which check the space used by
users on a Mac OS X server. At the present time, when I want to check how much
space users have on the server, I click on a refresh button, which execute the
following UNIX command 'du -sk *'. I have added a checkbutton which could
execute an automatic refresh, but I don't know which function I could use to do
this automatic refresh. Could somebody help me?

Thanks in advance

Patrick

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