After trial/error, I'm very very close. I'm capturing the subprocess ID with the following: 
$sub_pid= open $pipe, "-|", "${tab}_${date}.sh 2>&1" or die "Can't exe
+cute $tab : $!\n";

[download]
then kill the process with: 
my $button = $popup->Button(
      -text => 'Kill',
      -command => [sub{`kill $sub_pid 2>&1` && warn "Can't kill subpro
+cess: $sub_pid\n"}],-background=>'slate grey');
  $button->pack;

[download]
Unfortunately $sub_pid returns 10523 rather than 10524. ps shows:
PID TTY TIME CMD
10514 pts/6 00:00:00 tools_generic.p
10523 pts/6 00:00:00 program1_125919
10524 pts/6 00:00:00 program1
10525 pts/6 00:00:00 ps
26437 pts/6 00:00:00 bas

I suppose this is a sub launching a sub? Therefore I must use KillFam?

So close!
honyok

In reply to Re^2: Tk Form GUI / external process error by honyok
in thread Tk Form GUI / external process error by honyok

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