Hello!
I found a nice way to blank the screen automatically in 5 minutes, but to delay screen lock by an hour (see the below screenshot). Which is great when at home I can move the mouse and the desktop is there for you without having to enter the password to unlock.
What I am looking for now is a shortcut/terminal command to blank the screen without having to wait for 5 minutes.
Thank you!
You can use
gnome-screensaver-command -a
If you don’t have the command available, you need to install the gnome-screensaver package
Problem: seems like it’s locking the screen (same as ‘-l’ option)
You should try anyway, it may be my configuration that force the lock, you may have a different configuration/behavior
Yes it did work for me. Then I have created the shortcut as follows.
Thanks for your help, I love GNU/Linux! (did I say that correctly? 
It’s okay but you might consider going with GNU+Linux. 
For some reason this reminded me of the joke here: “How many GNU/Linux users are needed to change a light bulb?” http://www.gnu.org/fun/jokes/users-lightbulb.html
In particular the guy reminding everyone that the right name is GNU/Lightbulb.
