[root@kvm7 ~]# systemctl -t help Available unit types: service socket target device mount automount snapshot timer swap path slice scope
[root@kvm7 ~]# systemctl --help
systemctl [OPTIONS...] {COMMAND} ...
Query or send control commands to the systemd manager.
-h --help Show this help
--version Show package version
-t --type=TYPE List only units of a particular type
--state=STATE List only units with particular LOAD or SUB or ACTIVE stat
-p --property=NAME Show only properties by this name
-a --all Show all loaded units/properties, including dead/empty
ones. To list all units installed on the system, use
the 'list-unit-files' command instead.
--reverse Show reverse dependencies with 'list-dependencies'
-l --full Don't ellipsize unit names on output
--fail When queueing a new job, fail if conflicting jobs are
pending
--irreversible When queueing a new job, make sure it cannot be implicitly
cancelled
--ignore-dependencies
When queueing a new job, ignore all its dependencies
--show-types When showing sockets, explicitly show their type
-i --ignore-inhibitors
When shutting down or sleeping, ignore inhibitors
--kill-who=WHO Who to send signal to
-s --signal=SIGNAL Which signal to send
-H --host=[USER@]HOST
Show information for remote host
-P --privileged Acquire privileges before execution
-q --quiet Suppress output
--no-block Do not wait until operation finished
--no-wall Don't send wall message before halt/power-off/reboot
--no-reload When enabling/disabling unit files, don't reload daemon
configuration
--no-legend Do not print a legend (column headers and hints)
--no-pager Do not pipe output into a pager
--no-ask-password
Do not ask for system passwords
--system Connect to system manager
--user Connect to user service manager
--global Enable/disable unit files globally
--runtime Enable unit files only temporarily until next reboot
-f --force When enabling unit files, override existing symlinks
When shutting down, execute action immediately
--root=PATH Enable unit files in the specified root directory
-n --lines=INTEGER Number of journal entries to show
-o --output=STRING Change journal output mode (short, short-monotonic,
verbose, export, json, json-pretty, json-sse, cat)
--plain Print unit dependencies as a list instead of a tree
Unit Commands:
list-units List loaded units
list-sockets List loaded sockets ordered by address
start [NAME...] Start (activate) one or more units
stop [NAME...] Stop (deactivate) one or more units
reload [NAME...] Reload one or more units
restart [NAME...] Start or restart one or more units
try-restart [NAME...] Restart one or more units if active
reload-or-restart [NAME...] Reload one or more units if possible,
otherwise start or restart
reload-or-try-restart [NAME...] Reload one or more units if possible,
otherwise restart if active
isolate [NAME] Start one unit and stop all others
kill [NAME...] Send signal to processes of a unit
is-active [NAME...] Check whether units are active
is-failed [NAME...] Check whether units are failed
status [NAME...|PID...] Show runtime status of one or more units
show [NAME...|JOB...] Show properties of one or more
units/jobs or the manager
set-property [NAME] [ASSIGNMENT...]
Sets one or more properties of a unit
help [NAME...|PID...] Show manual for one or more units
reset-failed [NAME...] Reset failed state for all, one, or more
units
list-dependencies [NAME] Recursively show units which are required
or wanted by this unit or by which this
unit is required or wanted
Unit File Commands:
list-unit-files List installed unit files
enable [NAME...] Enable one or more unit files
disable [NAME...] Disable one or more unit files
reenable [NAME...] Reenable one or more unit files
preset [NAME...] Enable/disable one or more unit files
based on preset configuration
is-enabled [NAME...] Check whether unit files are enabled
mask [NAME...] Mask one or more units
unmask [NAME...] Unmask one or more units
link [PATH...] Link one or more units files into
the search path
get-default Get the name of the default target
set-default NAME Set the default target
Job Commands:
list-jobs List jobs
cancel [JOB...] Cancel all, one, or more jobs
Snapshot Commands:
snapshot [NAME] Create a snapshot
delete [NAME...] Remove one or more snapshots
Environment Commands:
show-environment Dump environment
set-environment [NAME=VALUE...] Set one or more environment variables
unset-environment [NAME...] Unset one or more environment variables
Manager Lifecycle Commands:
daemon-reload Reload systemd manager configuration
daemon-reload Reload systemd manager configuration
daemon-reexec Reexecute systemd manager
System Commands:
default Enter system default mode
rescue Enter system rescue mode
emergency Enter system emergency mode
halt Shut down and halt the system
poweroff Shut down and power-off the system
reboot Shut down and reboot the system
kexec Shut down and reboot the system with kexec
exit Request user instance exit
switch-root [ROOT] [INIT] Change to a different root file system
suspend Suspend the system
hibernate Hibernate the system
hybrid-sleep Hibernate and suspend the system