How to stop the swatchdog scipt running in the background?

Under Ubuntu 20 I have installed Swatchdog and started five daemon processes (running in the background).

Now I wanted to stop the script, so I used apt-get remove swatch.

However, as I could notice, this did not remove the background processes.

What is the command to remove the swatchdog processes?

I used ps -eo 'tty,pid,comm' | grep ^? to list all background processes and found it with:

158434 /usr/bin/swatch

I also found 461 watchdogd but guess it's unrelated.

PS: I guess a server restart would work. But I like to do it without restart.

As man page says:

Swatchdog will terminate gracefully when it receives a QUIT, TERM, or INT signal.

So you can send those signals to stop the process, in your case kill -2 158434 where 158434 is the process PID, or more human variant kill -INT 158434

For more detail information see man kill.

Hope it helps.