1 files changed, 53 insertions, 0 deletions
diff --git a/nixos/doc/manual/administration/user-sessions.xml b/nixos/doc/manual/administration/user-sessions.xml
new file mode 100644
index 000000000000..05e2c1a9b29f
--- /dev/null
+++ b/nixos/doc/manual/administration/user-sessions.xml
@@ -0,0 +1,53 @@
+<chapter xmlns="http://docbook.org/ns/docbook"
+        xmlns:xlink="http://www.w3.org/1999/xlink"
+        xmlns:xi="http://www.w3.org/2001/XInclude"
+        version="5.0"
+        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
+<command>loginctl</command> allows querying and manipulating user
+sessions.  For instance, to list all user sessions:
+
+<screen>
+$ loginctl
+   SESSION        UID USER             SEAT
+        c1        500 eelco            seat0
+        c3          0 root             seat0
+        c4        500 alice
+</screen>
+
+This shows that two users are logged in locally, while another is
+logged in remotely.  (“Seats” 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:
+
+<screen>
+$ 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
+</screen>
+
+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:
+
+<screen>
+$ loginctl terminate-session c3
+</screen>
+
+</para>
+
+</chapter>
\ No newline at end of file