Comments on: How to Use Shutdown, Poweroff, Halt, and Reboot Commands in Linux

By: Ronald

Ronald — Thu, 01 May 2025 08:43:51 +0000

You need to correct the text. I wanted to power off a server and used halt -p, since shutdown -p does not work — the correct option is shutdown -P. The following are the options for the shutdown command in Linux: -r: Requests that the system be rebooted after it has been brought down. -h: Requests that the system be either halted or powered off after it has been brought down, with the choice left up to the system. -H: Requests that the system be halted after it has been brought down. -P: Requests that the system be powered off after it has been brought down. -c: Cancels a running shutdown. TIME is not specified with this option; the first argument is the MESSAGE. -k: Only sends out the warning messages and disables logins — does not actually bring the system down.

By: Robin A. Meade

Robin A. Meade — Sat, 01 Aug 2020 18:50:34 +0000

Shouldn't it be uppercase -P for power-off?

By: OluKayode Mayomi

OluKayode Mayomi — Wed, 03 Jun 2020 21:43:52 +0000

Some of y'all are imbecile, there is a reason for having all 3 commands as they are similar but not the same. For instance, the shutdown command will also write a shutdown script. Perhaps, you just want to do low-level maintenance, halt will be a suitable command to use as it will stop all running process and stop the CPU as well. You will probably remember halt quicker than Shutdown -H and as for reboot, self explanatory. Easier to remember as opposed to shutdown -r., etc.

By: Oi oi

Oi oi — Fri, 22 Nov 2019 15:10:36 +0000

In reply to Tanmaya Meher.

poweroff master race

By: Ken

Ken — Tue, 21 Aug 2018 19:57:54 +0000

Can I configure the amount of time the system is powered off during a reboot command? (Using Centos 7)