in reply to Signal Capturing....
Once you've started your Perl script from Tcl, all you need to do is send it any one of several signals -- including, but not limited to SIGBREAK SIGINT SIGQUIT SIGTERM -- that will cause it to die immediately*.
So, now all you need to know is how to send signals from Tcl -- which is a question for a Tcl forum not a Perl forum.
(*Unless the author of the Perl script has decided to trap that signal.)
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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Seekers of Perl Wisdom