centos man page for shutdown

Query: shutdown

OS: centos

Section: 8

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

SHUTDOWN(8)							     shutdown							       SHUTDOWN(8)

NAME
shutdown - Halt, power-off or reboot the machine
SYNOPSIS
shutdown [OPTIONS...] [TIME] [WALL...]
DESCRIPTION
shutdown may be used to halt, power-off or reboot the machine. 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. 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. Note that to specify a wall message you must specify a time argument, too. 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.
OPTIONS
The following options are understood: --help Prints a short help text and exits. -H, --halt Halt the machine. -P, --poweroff Power-off the machine (the default). -r, --reboot Reboot the machine. -h Equivalent to --poweroff, unless --halt is specified. -k Do not halt, power-off, reboot, just write wall message. --no-wall Do not send wall message before halt, power-off, reboot. -c Cancel a pending shutdown. This may be used cancel the effect of an invocation of shutdown with a time argument that is not "+0" or "now".
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
SEE ALSO
systemd(1), systemctl(1), halt(8), wall(1) systemd 208 SHUTDOWN(8)
Related Man Pages
systemd-halt.service(8) - ultrix
systemd-halt.service(8) - xfree86
systemd-halt.service(8) - debian
systemd-halt.service(8) - minix
systemd-halt.service(8) - osx
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