Using screen

Jacob Hurley jacobh at aos5.com
Thu Feb 20 05:22:44 CST 2003


Hmm, I am fairly new to the screen command but I have tried to do what
you have mentioned.  Here is what is happening for me:

I ssh to machine one, run screen and then a couple extra ctl-a+c for a
few more screens, then I do  ctl-a+" to see a listing of my screens, I
then go to screen 3 and ssh to another machine. If I jump back to screen
1 this is what I see:

bash-2.05b$ w
 10:58pm  up 9 days,  6:10,  5 users,  load average: 0.00, 0.00, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU  WHAT
AOS5+jac pts/0    nocuser.aos5.com 10:53pm  0.00s  0.04s  0.00s  screen
AOS5+jac pts/1    -                10:54pm  1:33   0.00s  0.00s  w
AOS5+jac pts/2    -                10:54pm  0.00s  0.02s  0.01s
/bin/bash
AOS5+jac pts/3    -                10:54pm 47.00s  0.33s  0.24s  ssh -p
24 -l hurleyj 172.16.2.199
AOS5+jac pts/4    -                10:56pm  1:42   0.01s  0.01s
/bin/bash 

Which all looks normal, so now I go to the screen where I have my ssh
session opened up, and run screen there:

hurleyj at 00YP5UV:~> w
 11:00pm  up 21 days,  8:24,  3 users,  load average: 0.04, 0.01, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU  WHAT
hurleyj  pts/1    172.16.2.243     10:52pm  0.00s  0.04s  0.01s  screen
hurleyj  pts/2    -                10:52pm  6:52   0.02s  0.02s
/bin/bash
hurleyj  pts/3    -                10:53pm  0.00s  0.02s  0.00s  w

which looks okay here too (but I had to actually type 'screen' for these
new ones, since a ctl-a+c would open a new screen on the original ssh
session).. and I cant get any ctl-a command to work with this second
session, I can't rotate through or select the screen I want because it
just uses the screen session from the first ssh connection.. hmm.. I
know there is a way to use ctl-a with certain applications within a
screen (looking through ctl-a+? now, but not sure) is this what I need
to do?

Can you explain more on how you used the command, and what the
interesting effect is? Cause I am wanting to be able to use the screen
command confidently and I am curious as to what you are speaking about.
Thanks, and BTW I originally ssh'ed in with secureCRT client, and I
didn't set the term on any of my screens in case you were curious.

Thanks again,

Jacob Hurley
Network Operations Center
Alexander Open Systems

-----Original Message-----
From: Jonathan Hutchins [mailto:hutchins at tarcanfel.org] 
Sent: Wednesday, February 19, 2003 5:56 PM
To: kclug at kclug.org
Subject: Using screen

An interesting effect can be obtained by using screen, the connecting 
to another computer via ssh, and running screen again.

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