Re: simply preserving sessions across disconnect

On Thu, Jun 30, 2011 at 2:29 PM, Adam Kellas <[email protected]> wrote:

> On Thu, Jun 30, 2011 at 10:07 AM, Juergen Weigert <jw-n+aIp8eCc/[email protected]> wrote:
> > I also believe this to be basic, that is why I implemented -D -RR
> > It was designed to exactly cover the use case you describe.
> > Grab a session if there is one, otherwise create one.
>
> Juergen,
>
> Thanks, it's good to know an author foresaw and supports this use
> case. It give me renewed hope this can be made to work.
>
> > Sorry to hear that some of your ssh connections start a fight.
> > Although I am not exactly sure what that means.
> > Is there something that I missed?
>
> Here's what I observe using PuTTY, which is just an ssh client for
> Windows, and connecting to a Fedora-based Linux machine. The "remote
> command" for putty is set to "screen -D -RR". At this time screen is
> not yet running for me, i.e. "screen -ls" returns "No Sockets found
> ...".
>
> I then do one putty login and get a new shell within screen. The title
> bar says "[screen:0 bash]", "echo $STY" reports a value
> "<pid>.pts-14.<hostname>", and "screen -ls" in my control (non-screen)
> terminal shows the same thing. To this point everything is going well.
>
> Now I start a second putty connection. This takes the screen window
> from the first one. The "echo $STY" command that I ran in the first
> putty window is now in the second one, and the first is showing a
> "Server unexpectedly closed network connection" error message. The
> "screen -ls" still shows just one socket, same one as above. So
> clearly the second putty login "stole" the screen window from the
> first one.
>
> I'm going to send you privately screen shots demonstrating this. My
> employer might quibble about me posting them on a list.
>
>
How about creating a script such as follows and running it as your
ssh-command.

#!/bin/sh


SESSION=$(screen -ls | grep detached | tail -1 | sed 's/^\s\+//' | sed
's/\s.*$//')

if [ "x${SESSION}" == "x" ]; then
    screen
else
    screen -R $SESSION
fi




> Thanks,
> AK
>
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>



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