'\" t .TH "SHUTDOWN" "8" "" "systemd 256.8" "shutdown" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .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)