Share a terminal screen with others
Share a terminal screen with others:
If you enable multiuser, then you can permit others to share your screen session. The following conditions apply:
1. screen must be suid root;
2. "multiuser on" must be configured in ~/.screenrc;
3. control the others user(s) access with "aclchg":
# ----- from ~/.screenrc-users -----
aclchg someuser +rx "#?" #enable r/o access to "someuser"
aclchg someuser -x "#,at,aclchg,acladd,acldel,quit" # don't allow these
aclchg otheruser +rwx "#?" # enable r/w access to "otheruser"
aclchg otheruser -x "#,at,aclchg,acladd,acldel,quit" # don't allow them to use these commands
# -----
After doing this (once), you start your session with:
$ screen
Then, the other user can join your terminal session(s) with youruserid:
$ screen -r youruserid/
Note: the trailing "/" is required.
Multiple users can share the same screen simultaneously, each with independent access controlled precisely with "aclchg" in the ~/.screenrc file.
I use the following setup:
# ~/.screenrc-base
# default screenrc on any host
source $HOME/.screenrc-base
source $HOME/.screenrc-$HOST
source $HOME/.screenrc-users
# -----
Then, the base configurations are in ~/.screenrc-base; the host-specific configurations are in ~/.screenrc-$HOST, and the user configurations are in ~/.screenrc-users.
The host-specific .screenrc file might contain some host-specific screen commands; e.g.:
# ~/.screen-myhost
# -----
screen -t 'anywhere' /bin/tcsh
screen -t 'anywhere1' /bin/tcsh
# ----
The .screenrc-base contains:
# ~/.screenrc-base
## I find typing ^a (Control-a) awkward. So I set the escape key to CTRL-j instead of a.
escape ^Jj
termcapinfo xterm* ti@:te@:
autodetach on
zombie kr
verbose on
multiuser on