ok, trying to do this for real…
I set suid on screen, so
mmm@kojiro:~/projects/ttu/doc$ ls -al /usr/bin/screen
-rwxr-sr-x 1 root utmp 340604 2010-08-17 10:55 /usr/bin/screen
becomes
mmm@kojiro:~/projects/ttu/doc$ ls -al /usr/bin/screen
-rwsr-sr-x 1 root utmp 340604 2010-08-17 10:55 /usr/bin/screen
and then /var/run/screen needs to be 755 instead of 775… i.e.,
mmm@kojiro:~/projects/ttu/doc$ ls -al /var/run | grep screen
drwxrwxr-x 5 root utmp 100 2011-02-08 10:17 screen
becomes
mmm@kojiro:~/projects/ttu/doc$ ls -al /var/run | grep screen
drwxr-xr-x 5 root utmp 100 2011-02-08 10:17 screen
Now, user1:
user1@kojiro:~$ screen -x -S junk -t junk
or just
user1@kojiro:~$ screen -S junk
user1 sets multiusermode
Ctrl-A :multiuser on
Ctrl-A :acladd user2
Ctrl-A :acladd user3
user2
user2@kojiro:~$ screen -x mmm/
user3
user3@kojiro:~$ screen -x mmm/
another version
For security reasons, screen by default is installed so that other users within the system can not attach to your screen sessions. To allow this to be changed one must set screen to run SUID root by doing the following (once):
sudo chmod +s /usr/bin/screen
sudo chmod 755 /var/run/screen
Then user1 can share their session on host as follows:
screen -S shared-session
Ctrla :multiuser on
Ctrla :acladd user2
user2 on host can then connect to the shared session like:
ssh user2@host
screen -x user1/shared-session
first view screen -S junk
second view screen -x -R junk
maybe this’ll work…
user1
screen -t junk
user2 becomes user1
screen -x -t junk
looks like this works… maybe overkill but wtf?
screen -xR -t junk -S junk
allegedly, screen -t junk screen -x -t junk should work
below is old
It’s possible for two users to share a screen session. This is particularly useful if multiple people want to monitor a long running task, and it’s easy to do.
user #1:
screen -R longbuild
user #2:
screen -x -R longbuild
The -x flag tells screen to allow you to attach to an already attached session. This is also good for crazy stuff like a collaborative Vim session (if you’re into that sort of thing).
If you have any questions or feedback, please feel free to share it with me on Twitter: @m_3