systemd Developer Lennart Poettering lennart@poettering.net loginctl 1 loginctl Control the systemd login manager loginctl OPTIONS COMMAND NAME loginctl may be used to introspect and control the state of the systemd1 login manager systemd-logind.service8. The following options are understood: --no-ask-password Do not query the user for authentication for privileged operations. -p --property= When showing session/user/seat properties, limit display to certain properties as specified as argument. If not specified, all set properties are shown. The argument should be a property name, such as Sessions. If specified more than once, all properties with the specified names are shown. --value When printing properties with show, only print the value, and skip the property name and =. -a --all When showing session/user/seat properties, show all properties regardless of whether they are set or not. -l --full Do not ellipsize process tree entries. --kill-who= When used with kill-session, choose which processes to kill. Must be one of leader, or all to select whether to kill only the leader process of the session or all processes of the session. If omitted, defaults to all. -s --signal= When used with kill-session or kill-user, choose which signal to send to selected processes. Must be one of the well known signal specifiers, such as SIGTERM, SIGINT or SIGSTOP. If omitted, defaults to SIGTERM. -n --lines= When used with user-status and session-status, controls the number of journal lines to show, counting from the most recent ones. Takes a positive integer argument. Defaults to 10. -o --output= When used with user-status and session-status, controls the formatting of the journal entries that are shown. For the available choices, see journalctl1. Defaults to short. The following commands are understood: list-sessions List current sessions. session-status ID… Show terse runtime status information about one or more sessions, followed by the most recent log data from the journal. Takes one or more session identifiers as parameters. If no session identifiers are passed, the status of the caller's session is shown. This function is intended to generate human-readable output. If you are looking for computer-parsable output, use show-session instead. show-session ID… Show properties of one or more sessions or the manager itself. If no argument is specified, properties of the manager will be shown. If a session ID is specified, properties of the session are shown. By default, empty properties are suppressed. Use --all to show those too. To select specific properties to show, use --property=. This command is intended to be used whenever computer-parsable output is required. Use session-status if you are looking for formatted human-readable output. activate ID Activate a session. This brings a session into the foreground if another session is currently in the foreground on the respective seat. Takes a session identifier as argument. If no argument is specified, the session of the caller is put into foreground. lock-session ID… unlock-session ID… Activates/deactivates the screen lock on one or more sessions, if the session supports it. Takes one or more session identifiers as arguments. If no argument is specified, the session of the caller is locked/unlocked. lock-sessions unlock-sessions Activates/deactivates the screen lock on all current sessions supporting it. terminate-session ID… Terminates a session. This kills all processes of the session and deallocates all resources attached to the session. kill-session ID… Send a signal to one or more processes of the session. Use --kill-who= to select which process to kill. Use --signal= to select the signal to send. list-users List currently logged in users. user-status USER… Show terse runtime status information about one or more logged in users, followed by the most recent log data from the journal. Takes one or more user names or numeric user IDs as parameters. If no parameters are passed, the status is shown for the user of the session of the caller. This function is intended to generate human-readable output. If you are looking for computer-parsable output, use show-user instead. show-user USER… Show properties of one or more users or the manager itself. If no argument is specified, properties of the manager will be shown. If a user is specified, properties of the user are shown. By default, empty properties are suppressed. Use --all to show those too. To select specific properties to show, use --property=. This command is intended to be used whenever computer-parsable output is required. Use user-status if you are looking for formatted human-readable output. enable-linger USER… disable-linger USER… Enable/disable user lingering for one or more users. If enabled for a specific user, a user manager is spawned for the user at boot and kept around after logouts. This allows users who are not logged in to run long-running services. Takes one or more user names or numeric UIDs as argument. If no argument is specified, enables/disables lingering for the user of the session of the caller. See also KillUserProcesses= setting in logind.conf5. terminate-user USER… Terminates all sessions of a user. This kills all processes of all sessions of the user and deallocates all runtime resources attached to the user. kill-user USER… Send a signal to all processes of a user. Use --signal= to select the signal to send. list-seats List currently available seats on the local system. seat-status NAME… Show terse runtime status information about one or more seats. Takes one or more seat names as parameters. If no seat names are passed the status of the caller's session's seat is shown. This function is intended to generate human-readable output. If you are looking for computer-parsable output, use show-seat instead. show-seat NAME… Show properties of one or more seats or the manager itself. If no argument is specified, properties of the manager will be shown. If a seat is specified, properties of the seat are shown. By default, empty properties are suppressed. Use --all to show those too. To select specific properties to show, use --property=. This command is intended to be used whenever computer-parsable output is required. Use seat-status if you are looking for formatted human-readable output. attach NAME DEVICE… Persistently attach one or more devices to a seat. The devices should be specified via device paths in the /sys file system. To create a new seat, attach at least one graphics card to a previously unused seat name. Seat names may consist only of a–z, A–Z, 0–9, - and _ and must be prefixed with seat. To drop assignment of a device to a specific seat, just reassign it to a different seat, or use flush-devices. flush-devices Removes all device assignments previously created with attach. After this call, only automatically generated seats will remain, and all seat hardware is assigned to them. terminate-seat NAME… Terminates all sessions on a seat. This kills all processes of all sessions on the seat and deallocates all runtime resources attached to them. On success, 0 is returned, a non-zero failure code otherwise. $ loginctl user-status fatima (1005) Since: Sat 2016-04-09 14:23:31 EDT; 54min ago State: active Sessions: 5 *3 Unit: user-1005.slice ├─user@1005.service … ├─session-3.scope … └─session-5.scope ├─3473 login -- fatima └─3515 -zsh Apr 09 14:40:30 laptop login[2325]: pam_unix(login:session): session opened for user fatima by LOGIN(uid=0) Apr 09 14:40:30 laptop login[2325]: LOGIN ON tty3 BY fatima There are two sessions, 3 and 5. Session 3 is a graphical session, marked with a star. The tree of processing including the two corresponding scope units and the user manager unit are shown. systemd1, systemctl1, systemd-logind.service8, logind.conf5