Using 'at' to open a 'screen' session?

FireRaven · 03-08-2011, 05:12 AM

Hi, when I type:

Code:

root@ubuntu:/# at now + 1 minute
warning: commands will be executed using /bin/sh
at> screen
at> <EOT>
job 2 at Tue Mar  8 22:14:00 2011
root@ubuntu:/#

After the command has run (verified with atq) I cannot attach to screen using "screen -r" and ps shows screen is not running:

Code:

root@ubuntu:/# ps ax | grep screen
21490 pts/3    R+     0:00 grep screen
root@ubuntu:/#

Any ideas why the 'at' command can't start screen in the background for me to attach to later?

EDIT: Noticed screen is actually returning "Must be connected to a terminal." to logs. Does 'at' not provide a terminal?

AlucardZero · 03-08-2011, 06:09 AM

Seems it doesn't. Use the following switches to start screen in detached mode (from "man screen"):

Code:

      -d -m   Start  screen in "detached" mode. This creates a new session but doesn’t attach to
               it. This is useful for system startup scripts.

acid_kewpie · 03-08-2011, 06:10 AM

no, at doesn't provide one, how would it? What would that mean?

http://www.manpagez.com/man/1/screen/

Quote:

-d -m Start screen in "detached" mode. This creates a new session but
doesn't attach to it. This is useful for system startup
scripts.

FireRaven · 03-08-2011, 02:04 PM

Thanks, that worked but screen when I attach to it has a very funny shell (not the usual root shell).
Are there certain startup scripts not being run?

When I say funny I mean it has "#" as a prompt instead of the usual "root@ubuntu:/#" prompt, colors are all black and white when typing ls.