Re: Detached sessions not being created

Mark,

I don't have a solution for you, but a question that might lead toward the 
solution:

In order to launch successfully (even in a detached mode), does screen need a 
controlling tty, a valid setting for $TERM, and valid termios information 
(screen dimensions)?  I think it might.

When you launch from Konsole, I'm certain it has all that.  But when you launch 
from cron, I'd be surprised if it has any of that.  


—Joe

--
We sell Spatulas, and that's all!
http://spatula-city.org/~im14u2c/
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________________________________
From: Mark Adams <[email protected]>
To: screen-users-mXXj517/[email protected]
Sent: Thu, November 22, 2012 10:37:51 PM
Subject: Detached sessions not being created

I have several machines on my network that provide services of one type or 
another. I'm trying to configure them to create detached screen sessions at boot 
time. Let's take a representative example.

I have a cron job setup under my user ID:

@reboot /usr/bin/screen -d -m -S pvr

I have also used the syntax "@reboot /usr/bin/screen -dmS pvr".

Neither of these has worked.

I tried creating a bash script:

#!/bin/bash
# This script starts a detached screen session on boot.
su - <my_user> -c "/usr/bin/screen -dmS pvr"


Neither of these work despite the fact that when I run the command  
"/usr/bin/screen -d -m -S pvr" as my user in a konsole window it creates  the 
screen session as expected (note that I can stack those options to  -dmS and it 
makes no difference).

I should say that I'm also  unable to start that screen session from crontab in 
Webmin (I assume it  uses the run-parts command to do that). I get no error - it 
just doesn't  create the screen session.

I set uid root: "chmod a+s /usr/bin/screen" and I have seen references to 
changed the permissions of /var/run/screen.  I have no /var/run/screen.


Any wisdom?

Thanks.

-- 
Mark Adams

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