How to pass a command to another Debian user's screen?

Question

Debian

How to pass a command to another user's screen in debian?
There is a command to pass to your screen:
screen -r name -X stuff 'ls -la' (any command)
There is a command to connect to another user's screen:
screen -x user/name
But when I write screen -x user/name -X stuff 'ls -la' will print "No screen session found."
The same thing happens with screen -r user/name -X stuff 'ls -la'
What am I doing wrong?

Answer 1

su user/name screen

Answer 2

gnu.su/plugins/forum/forum_viewtopic.php?354.post

Answer 3

I don’t understand, what’s stopping you from running under the right user right away and not turning into a masochist?