[linux] What's the best way to send a signal to all members of a process group?

I know that is old, but that is the better solution that i found:

killtree() { 
    for p in $(pstree -p $1 | grep -o "([[:digit:]]*)" |grep -o "[[:digit:]]*" | tac);do
        echo Terminating: $p 
        kill $p
    done
}

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