Kill a Process in Linux from command line using kill command:

kill process by name:

kill $(ps aux | grep 'process_name' | awk '{print $2}')

kill process by ID

kill -9 PID

Kill all descendant/recursively processes

The easy way to do this in a shell script is using pkill command:

pkill -TERM -P 123456

where PPID / parent processes PID is 123456

if pkill isn’t available, try this way:

kill $(ps -o pid= --ppid $$)

or using PGID / group number of process group you want to kill

kill -TERM -- -123456 where PGID is 123456