View Full Version : [ubuntu] command line shutdown?

December 16th, 2010, 08:54 PM
previously i could shut a machine down from the command line:

sudo shutdown now

with maverick this seem to crash the system? similar symptoms on two machines, my desktop and notebook.

the desktop brings up a blue curses recovery screen, the notebook seems to just park at a black screen with some errors.

machines shuts down fine from the gui, what changed?

December 16th, 2010, 09:02 PM
Try it with the -h option:

sudo shutdown now -h

December 16th, 2010, 09:16 PM

sudo poweroff

sudo reboot is also handy.

December 16th, 2010, 09:19 PM
Try it with the -h option:

sudo shutdown now -h


what is the '-h' argument/option in the end? Just curious. :) I am not at a machine that has a linux terminal so I can't use the 'man' command right now. Sorry. Thanks for the help.


December 16th, 2010, 09:20 PM
-h Requests that the system be either halted or powered off after
it has been brought down, with the choice as to which left up to
the system.

December 16th, 2010, 09:21 PM
Perfect. Thanks for the quick info. :)


December 16th, 2010, 09:24 PM
Thanks for that - I always used sudo shutdown -g0 -i0 - That's all I could remember from my Unix days (works fine with Linux though)


December 16th, 2010, 09:28 PM
For poweroff,

shutdown -h now

For restart,

shutdown -r now

December 16th, 2010, 09:29 PM
-h halts the machine*
-P powers off the machine
-r reboots the machine

*Halting a machine can mean different things (often configurable in the BIOS)
Normally for desktop machines, the BIOS powers off the machine when asked to "halt"

An interesting tit-bit, you mentioned the system "crashing" when you shutdown. Well, that's exactly what happens behind the scenes.
The OS puts itself into a clean state, then issues a command to the CPU that stops all system operations.
Halting a system is a controlled crash