How to listen to a daemon output?

Question

I have a daemon that prints some information on to the terminal. I can see these informations by typing: systemctl status bot.service, this is working well, but this command doesn't listen to the new output, so if I want to see the new output, generated, then I need to retype the command.

Is there a way to always listen to the daemon and let the output display in the terminal without retype the command?

Answer 1

There are two ways. You need elevated powers for both (eg. use sudo, or be a member of the systemd-journal group).

1. Use journalctl:

   journalctl -fu bot
   

2. Find the log the output goes to and tail -f it. Very likely it's /var/log/syslog. Then do:

   tail -f /var/log/syslog
   

   There will be other entries intermixed though.