Help with screen

[gnulnx]

Hi everyone. I am looking for some help with screen. I am attempting to resume another user's screen (-r) and execute a command in it (-X) While I can resume (-r), if I combine that with executing a command (-X), errors arise. Instead of trying to explain my problems, see the below outputs.

• All screens are ran as one user ("minecraft")
• minecraft has his .screenrc file setup to enable multiuser mode, and to allow access from kjohnson

minecraft@mc1:~$ screen -list
There are screens on:
    18810.threatgreater    (10/05/2010 02:23:31 PM)    (Multi, detached)
    1185.baron    (10/05/2010 07:29:26 AM)    (Multi, detached)
    1184.murpo    (10/05/2010 07:29:26 AM)    (Multi, detached)
    1182.michaelvash    (10/05/2010 07:29:26 AM)    (Multi, detached)
    1181.dungeonbstrd    (10/05/2010 07:29:26 AM)    (Multi, detached)
5 Sockets in /var/run/screen/S-minecraft.
minecraft@mc1:~$ ls -al !$
ls -al /var/run/screen/S-minecraft/
total 0
drwx------ 2 minecraft minecraft 140 2010-10-05 20:10 .
drwxr-xr-x 3 root      utmp       60 2010-10-05 07:29 ..
prw------x 1 minecraft minecraft   0 2010-10-05 20:00 1181.dungeonbstrd
prw------x 1 minecraft minecraft   0 2010-10-05 20:00 1182.michaelvash
prw------x 1 minecraft minecraft   0 2010-10-05 20:09 1184.murpo
prw------x 1 minecraft minecraft   0 2010-10-05 20:00 1185.baron
prw------x 1 minecraft minecraft   0 2010-10-05 20:00 18810.threatgreater

kjohnson@mc1:~$ screen -r minecraft/
There are several suitable screens on:
    18810.threatgreater    (10/05/2010 02:23:31 PM)    (Multi, detached)
    1185.baron    (10/05/2010 07:29:26 AM)    (Multi, detached)
    1184.murpo    (10/05/2010 07:29:26 AM)    (Multi, detached)
    1182.michaelvash    (10/05/2010 07:29:26 AM)    (Multi, detached)
    1181.dungeonbstrd    (10/05/2010 07:29:26 AM)    (Multi, detached)
Type "screen [-d] -r [pid.]tty.host" to resume one of them.
kjohnson@mc1:~$ screen -r minecraft/murpo
<<SCREEN SHOWS UP>>
kjohnson@mc1:~$ screen -r minecraft/murpo -X date
Cannot opendir /var/run/screen/S-minecraft: Permission denied
kjohnson@mc1:~$ sudo chmod 755 /var/run/screen/S-minecraft/
kjohnson@mc1:~$ screen -r minecraft/murpo -X date
Directory /var/run/screen/S-minecraft must have mode 700.
kjohnson@mc1:~$ sudo chmod 700 /var/run/screen/S-minecraft/
kjohnson@mc1:~$ screen -r minecraft/murpo -X date
Cannot opendir /var/run/screen/S-minecraft: Permission denied

I've tried everything that I can find. Please, any suggestions?

[gnulnx]

Reading through the screen man page again and I can't find anything that I might be doing wrong.

-X Send the specified command to a running screen session. You can use the -d or -r option to tell screen to look only for attached or detached screen sessions. Note that this command doesn't work if the session is password protected.

My sessions are not password protected.

What is confusing me most is, I can resume the screen, which I assume needs access to /var/run/screen/S-minecraft, however when I try to resume and execute (-r minecraft/name -X cmd), I get a permission denied error for that very directory.