pyrox.dev
1<chapter xmlns="http://docbook.org/ns/docbook"
2 xmlns:xlink="http://www.w3.org/1999/xlink"
3 xmlns:xi="http://www.w3.org/2001/XInclude"
4 version="5.0"
5 xml:id="sec-user-sessions">
6 <title>User Sessions</title>
7 <para>
8 Systemd keeps track of all users who are logged into the system (e.g. on a
9 virtual console or remotely via SSH). The command <command>loginctl</command>
10 allows querying and manipulating user sessions. For instance, to list all
11 user sessions:
12<screen>
13$ loginctl
14 SESSION UID USER SEAT
15 c1 500 eelco seat0
16 c3 0 root seat0
17 c4 500 alice
18</screen>
19 This shows that two users are logged in locally, while another is logged in
20 remotely. (“Seats” are essentially the combinations of displays and input
21 devices attached to the system; usually, there is only one seat.) To get
22 information about a session:
23<screen>
24$ loginctl session-status c3
25c3 - root (0)
26 Since: Tue, 2013-01-08 01:17:56 CET; 4min 42s ago
27 Leader: 2536 (login)
28 Seat: seat0; vc3
29 TTY: /dev/tty3
30 Service: login; type tty; class user
31 State: online
32 CGroup: name=systemd:/user/root/c3
33 ├─ 2536 /nix/store/10mn4xip9n7y9bxqwnsx7xwx2v2g34xn-shadow-4.1.5.1/bin/login --
34 ├─10339 -bash
35 └─10355 w3m nixos.org
36</screen>
37 This shows that the user is logged in on virtual console 3. It also lists the
38 processes belonging to this session. Since systemd keeps track of this, you
39 can terminate a session in a way that ensures that all the session’s
40 processes are gone:
41<screen>
42# loginctl terminate-session c3
43</screen>
44 </para>
45</chapter>