Difference between “halt” and “shutdown now”?
When you execute a command (
sudo halt ) Command System stops working
So you execute this command on another set of computers and the result was that the freeze system
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The shutdown command can be used to shutdown or reboot the system. You also have a time option.
To shutdown the system now you can use.
The -h refers to halt of the system.
If you wanted the system to shutdown at a specific time you could use something like this.
A message will be sent out to all users at 12:30 that the system will shutdown at 12:45.
As some of the other answers have mentioned you can also use on most systems.
To reboot the system you can use the same commands I have mentioned just substitute the halt for reboot or the -h for an -r for example.