08-30-2008
Send a massive message to the connected users
How can I send a message for all the users connected into the system at the same time? Let's say I need to reboot the server and I ask the users to save their jobs becasue the server will be rebooted?
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reboot(1M) reboot(1M)
NAME
reboot - reboot the system
SYNOPSIS
time] message]
time] message]
DESCRIPTION
The command terminates all currently executing processes except those essential to the system, then reboots the system, or halts, or makes
the partition ready for reconfiguration. When invoked without arguments, syncs all disks before rebooting the system.
Options
The command recognizes the following options:
Shut down the system and halt.
Shut down the system and reboot automatically (default).
Shut down the system to a ready-to-reconfigure state and reboot if possible.
If the partition is unable to reboot, it will stop at a ready-to-reconfigure state. However, if the option is also
specified, the system will always stop at ready-to-reconfigure state. This option is available only on systems that
support hardware partitions.
Shut down the system to a ready-to-reconfigure state and do not reboot.
This option can be used only in combination with the option. This option is available only on systems that support
hardware partitions.
Do not sync the file systems before shutdown.
The and options are ignored with this option.
Sync the file systems before shutdown;
for file systems that were cleanly mounted, modify the flag from to (default).
Quick and quiet.
Suppress broadcast of warning messages, terminate processes by brute force (with and immediately call with arguments
as indicated by the other options (see reboot(2)). No logging is performed. The and options are ignored with this
option.
Specify what time
will bring the system down. time can be the word (indicating immediate shutdown) or a future time in one of two for-
mats: and The first form brings the system down in number minutes; the second brings the system down at the time of
day indicated (based on a 24-hour clock).
Display message at the terminals of all users on the system at decreasing intervals as reboot time approaches. The message
must not contain any embedded double quotes.
At shutdown time a message is written in the file
(if it exists), containing the time of shutdown, who ran and the reason.
Only users with appropriate privileges can execute the command.
WARNINGS
does not invoke the shutdown scripts associated with subsystems to bring them down in a cautious manner. See shutdown(1M).
If the option is used in a virtual partition environment on a partitionable system, then the requested reconfiguration will not take place
until all the virtual partitions on that hard partition are shut down and the virtual partition monitor is rebooted.
AUTHOR
was developed by HP and the University of California, Berkeley.
FILES
Shutdown log
SEE ALSO
vpartition(1), reboot(2), partition(5).
reboot(1M)