How to list running screen sessions

Question

I have a bunch of servers  on which I run experiments using screen  The procedure is the following     ssh to server XXX launch screen start experiments in a few tabs detach screen disconnect from the server   While the experiments are running  I can easily find on which servers they are by sshing to all servers and listing my running processes  using top or ps    However  once the experiments are finished  how could I find on which servers I have a screen session opened  so that I can have a look at the output  relaunch them  etc      PS  my experiments do print their output to files  too    but this is not the point of my question

User · Accepted Answer

To list all of the screen sessions for a user, run the following command as that user:

screen -ls

To see all screen sessions on a specific machine you can do:

ls -laR /var/run/screen/

I get this on my machine:

gentle ~ # ls -laR /var/run/screen/

/var/run/screen/:
total 1
drwxrwxr-x  4 root utmp   96 Mar  1  2005 .
drwxr-xr-x 10 root root  840 Feb  1 03:10 ..
drwx------  2 josh users  88 Jan 13 11:33 S-josh
drwx------  2 root root   48 Feb 11 10:50 S-root

/var/run/screen/S-josh:
total 0
drwx------ 2 josh users 88 Jan 13 11:33 .
drwxrwxr-x 4 root utmp  96 Mar  1  2005 ..
prwx------ 1 josh users  0 Feb 11 10:41 12931.pts-0.gentle

/var/run/screen/S-root:
total 0
drwx------ 2 root root 48 Feb 11 10:50 .
drwxrwxr-x 4 root utmp 96 Mar  1  2005 ..

This is a rather brilliantly Unixy use of Unix Sockets wrapped in filesystem permissions to handle security, state, and streams.

User · Answer

While joshperry s answer is correct  I find very annoying that it does not tell you the screen name  the one you set with -t option   that is actually what you use to identify a session   not his fault  of course  that s a screen s flaw   That s why I instead use a script such as this  ps auxw grep -i screen grep -v grep

User · Answer

I m not really sure of your question  but if all you really want is list currently opened screen session  try   screen -ls

User · Answer

In most cases a screen -RRx  username  will suffice     If you still want to list all screens then put the following script in your path and call it screen or whatever you like      bin bash if      1      -ls-all      then     exec  usr bin screen      else     shopt -s nullglob     screens   var run screen S-         if       screens        0     then         echo  no screen session found in  var run screen      else         echo    screens     S-       fi fi   It will behave exactly like screen except for showing all screen sessions  when giving the option -ls-all as first parameter

User · Answer

So you re using screen to keep the experiments running in the background  or what  If so  why not just start it in the background     experiment  amp    And if you re asking how to get notification the job i done  how about stringing the experiment together with a mail command     experiment  amp  amp  echo  the deed is done    mail youruser yourlocalworkstation -s  job on server  HOSTNAME is done

User · Answer

ps x   grep SCREEN   to see what is that screen running in case you used the command     screen -A -m -d php make something php

User · Answer

For windows system   Open putty   then login in server   If you want to see screen in Console then you have to write command   Screen -ls   if you have to access the screen then you have to use below command   screen -x screen id   Write PWD in command line to check at which folder you are currently

User · Answer

The command screen -list may be what you want   See the man

User · Answer

Multiple folks have already pointed that    screen -ls   would list the screen sessions   Here is another trick that may be useful to you   If you add the following command as a last line in your  bashrc file on server xxx  then it will automatically reconnect to your screen session on login   screen -d -r   Hope you find it useful

[linux] How to list running screen sessions?

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