Problem with `sudo halt` command

Question

Possible Duplicate:
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

Answer 1

sudo halt will halt the machine, and on some hardware also power it down. sudo halt -p will power off the system.

Answer 2

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.

$ sudo shutdown -h now

or

$ sudo shutdown -h 0 

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.

$ sudo shutdown -h 12:45 "Server is going down for upgrades" 

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.

$ sudo halt
$ sudo poweroff

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.

$ sudo shutdown -r now