Found a better solution.

If I use killfam instead of kill then all the children are signalled and in this case killed as well.

See http://search.cpan.org/~lusol/tkjuke-1.0.6/Proc/Killfam.pm

In reply to Re^3: Tk and IPC - killing of process not working in Linux by Dirk80
in thread Tk and IPC - killing of process not working in Linux by Dirk80

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