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<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-user-sessions">
<title>User Sessions</title>
<para>
Systemd keeps track of all users who are logged into the system
(e.g. on a virtual console or remotely via SSH). The command
<literal>loginctl</literal> allows querying and manipulating user
sessions. For instance, to list all user sessions:
</para>
<programlisting>
$ loginctl
SESSION UID USER SEAT
c1 500 eelco seat0
c3 0 root seat0
c4 500 alice
</programlisting>
<para>
This shows that two users are logged in locally, while another is
logged in remotely. (<quote>Seats</quote> are essentially the
combinations of displays and input devices attached to the system;
usually, there is only one seat.) To get information about a
session:
</para>
<programlisting>
$ loginctl session-status c3
c3 - root (0)
Since: Tue, 2013-01-08 01:17:56 CET; 4min 42s ago
Leader: 2536 (login)
Seat: seat0; vc3
TTY: /dev/tty3
Service: login; type tty; class user
State: online
CGroup: name=systemd:/user/root/c3
├─ 2536 /nix/store/10mn4xip9n7y9bxqwnsx7xwx2v2g34xn-shadow-4.1.5.1/bin/login --
├─10339 -bash
└─10355 w3m nixos.org
</programlisting>
<para>
This shows that the user is logged in on virtual console 3. It also
lists the processes belonging to this session. Since systemd keeps
track of this, you can terminate a session in a way that ensures
that all the session’s processes are gone:
</para>
<programlisting>
# loginctl terminate-session c3
</programlisting>
</chapter>
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