'\" t
.TH "SHUTDOWN" "8" "" "systemd 256~rc3" "shutdown"
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.SH "NAME"
shutdown \- Halt, power off or reboot the machine
.SH "SYNOPSIS"
.HP \w'\fBshutdown\fR\ 'u
\fBshutdown\fR [OPTIONS...] [TIME] [WALL...]
.SH "DESCRIPTION"
.PP
\fBshutdown\fR
may be used to halt, power off, or reboot the machine\&.
.PP
The first argument may be a time string (which is usually
"now")\&. Optionally, this may be followed by a wall message to be sent to all logged\-in users before going down\&.
.PP
The time string may either be in the format
"hh:mm"
for hour/minutes specifying the time to execute the shutdown at, specified in 24h clock format\&. Alternatively it may be in the syntax
"+m"
referring to the specified number of minutes m from now\&.
"now"
is an alias for
"+0", i\&.e\&. for triggering an immediate shutdown\&. If no time argument is specified,
"+1"
is implied\&.
.PP
Note that to specify a wall message you must specify a time argument, too\&.
.PP
If the time argument is used, 5 minutes before the system goes down the
/run/nologin
file is created to ensure that further logins shall not be allowed\&.
.SH "OPTIONS"
.PP
The following options are understood:
.PP
\fB\-\-help\fR
.RS 4
Print a short help text and exit\&.
.RE
.PP
\fB\-H\fR, \fB\-\-halt\fR
.RS 4
Halt the machine\&.
.RE
.PP
\fB\-P\fR, \fB\-\-poweroff\fR
.RS 4
Power the machine off (the default)\&.
.RE
.PP
\fB\-r\fR, \fB\-\-reboot\fR
.RS 4
Reboot the machine\&.
.RE
.PP
\fB\-h\fR
.RS 4
The same as
\fB\-\-poweroff\fR, but does not override the action to take if it is "halt"\&. E\&.g\&.
\fBshutdown \-\-reboot \-h\fR
means "poweroff", but
\fBshutdown \-\-halt \-h\fR
means "halt"\&.
.RE
.PP
\fB\-k\fR
.RS 4
Do not halt, power off, or reboot, but just write the wall message\&.
.RE
.PP
\fB\-\-no\-wall\fR
.RS 4
Do not send wall message before halt, power off, or reboot\&.
.RE
.PP
\fB\-c\fR
.RS 4
Cancel a pending shutdown\&. This may be used to cancel the effect of an invocation of
\fBshutdown\fR
with a time argument that is not
"+0"
or
"now"\&.
.RE
.PP
\fB\-\-show\fR
.RS 4
Show a pending shutdown action and time if there is any\&.
.sp
Added in version 250\&.
.RE
.SH "EXIT STATUS"
.PP
On success, 0 is returned, a non\-zero failure code otherwise\&.
.SH "COMPATIBILITY"
.PP
The
\fB shutdown\fR
command in previous init systems (including sysvinit) defaulted to single\-user mode instead of powering off the machine\&. To change into single\-user mode, use
\fBsystemctl rescue\fR
instead\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1), \fBsystemctl\fR(1), \fBhalt\fR(8), \fBwall\fR(1)