Command Line

This chapter gives an overview of how to manage a ThinLinc cluster using the command line. Detailed descriptions of available commands can be found in Commands on the ThinLinc Server.


It is recommended to configure sudo so that these commands can be run without having to specify an absolute path. See Run ThinLinc administration commands using sudo for details.

Managing Sessions

Users’ sessions can be examined and controlled using tlctl session. With this tool, it is possible to list sessions currently running on the cluster:

$ sudo tlctl session list
USER   DISPLAY  AGENT               STATUS     AGE
alice  12  connected  11 day(s)
bob    32  connected  5 hour(s)

Listed 2 session(s).

If only some sessions are interesting, then it is possible to list just those:

$ sudo tlctl session list --agent
bob   32  connected  5 hour(s)

Listed 1 session(s).

It may happen that something has gone wrong with a user’s session and needs to be restarted. The tlctl session command can then be used to terminate that session:

$ sudo tlctl session terminate --user bob
Refreshing session information...

bob   32

  Terminate 1 session(s)

Is this ok? [y/N]: y

Notifying Users

Sometimes it may be necessary to inform users of important events, e.g. that a server needs to be restarted. Historically, the wall command was used for this, but it is mostly ignored by desktop environments and users may not have a terminal open.

ThinLinc includes the tool tl-notify that instead uses the notification mechanism built into most desktop environments. With this tool, it is easy to send a message to users:

$ sudo tl-notify The system will be restarted in one hour

Note that this command only notifies the users on the agent where the command is run. It is therefore recommended to also use tl-ssh-all:

$ sudo tl-ssh-all tl-notify The system will be restarted in one hour

Cluster Load

The current status of ThinLinc’s load monitoring can be examined using tlctl load. The command tlctl load list can be used to get a brief overview of the entire cluster:

$ sudo tlctl load list
===========================================     11  14%   0%   10.85     10  10%   0%   29.88

More details can be fetched about a specific agent using tlctl load show:

$ sudo tlctl load show
       Number of users: 11
Memory (used RAM+Swap): 14%
      RAM (used/total): 0.5/1.8 GiB
     Swap (used/total): 0.0/1.6 GiB
          Load (1 min): 0.0
        Number of CPUs: 2
                   CPU: 0%
              Bogomips: 11999.98
                Rating: 10.85
        Penalty points: 0
          Last updated: 24 s ago