1SHUTDOWN(8)                        shutdown                        SHUTDOWN(8)
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NAME

6       shutdown - Halt, power-off or reboot the machine
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SYNOPSIS

9       shutdown [OPTIONS...] [TIME] [WALL...]
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DESCRIPTION

12       shutdown may be used to halt, power-off or reboot the machine.
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14       The first argument may be a time string (which is usually now).
15       Optionally, this may be followed by a wall message to be sent to all
16       logged-in users before going down.
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18       The time string may either be in the format hh:mm for hour/minutes
19       specifying the time to execute the shutdown at, specified in 24h clock
20       format. Alternatively it may be in the syntax +m referring to the
21       specified number of minutes m from now.  now is an alias for +0, i.e.
22       for triggering an immediate shutdown. If no time argument is specified,
23       +1 is implied.
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25       Note that to specify a wall message you must speciy a time argument,
26       too.
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28       If the time argument is used, 5 minutes before the system goes down the
29       /etc/nologin file is created to ensure that further logins shall not be
30       allowed.
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OPTIONS

33       The following options are understood:
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35       --help
36           Prints a short help text and exits.
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38       -H, --halt
39           Halt the machine.
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41       -P, --poweroff
42           Power-off the machine (the default).
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44       -r, --reboot
45           Reboot the machine.
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47       -h
48           Equivalent to --poweroff, unless --halt is specified.
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50       -k
51           Don´t halt, power-off, reboot, just write wall message.
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53       --no-wall
54           Don´t send wall message before halt, power-off, reboot.
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56       -c
57           Cancel a pending shutdown. This may be used cancel the effect of an
58           invocation of shutdown with a time argument that is not +0 or now.
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EXIT STATUS

61       On success 0 is returned, a non-zero failure code otherwise.
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NOTES

64       This is a legacy command available for compatibility only.
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SEE ALSO

67       systemd(1), systemctl(1), halt(8), wall(1)
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AUTHOR

70       Lennart Poettering <lennart@poettering.net>
71           Developer
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75systemd                           09/14/2010                       SHUTDOWN(8)
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