How to kill all subprocesses of shell?

bash shell process fork kill

pkill -P $$

will fit (just kills it's own descendants)

EDIT: I got a downvote, don't know why. Anyway here is the help of -P

   -P, --parent ppid,...          Only match processes whose parent process ID is listed.

bash shell process fork kill

After starting each child process, you can get its id with

ID=$!

Then you can use the stored PIDs to find and kill all grandchild etc. processes as described here or here.

bash shell process fork kill

If you use a negative PID with kill it will kill a process group. Example:

kill -- -1234

CodeHunter