What is the name of the command for locking the screen in ubuntu?

Question

ubuntu

I installed the alarm clock program to lock the screen after a while. And then you work for a long time and forget to break for rest.
So, you need a command to lock the screen, to enter in the "command" field.

Until now, I worked in xubuntu, it's easy with commands, but how can I find the right command in unity?
Thanks in advance.

Answer 1

It is necessary to register gnome-session-quit --no-prompt
Also this command can be called from the terminal.