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It’s awfull when you don’t have a response from a running program. You’re waiting and wasting your time and nothing happens. To terminate a linux program on the quick and dirty way i use the simple shell script. The script takes a as argument the programm name. Just place it in a directory inside your [...]

Do this in two steps:
$str =~ s/^\s+//;
$str =~ s/\s+$//;