To kill a process in Unix, you can use the kill command followed by the process ID (PID) of the process you want to kill, like this:
kill PID
For example, if the PID of the process you want to kill is 12345, you would run:
kill 12345
You can also use the killall command to kill all processes with a specific name, like this:
killall process_name
For example, to kill all processes with the name "firefox", you would run:
killall firefox
If you want to kill a process and all its child processes, you can use the pkill command followed by the name of the process, like this:
pkill -9 process_name
The -9 option sends a SIGKILL signal to the process, which forces it to terminate immediately.
Note that these commands will only work if you have the necessary permissions to kill processes.