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Showing content from https://www.geeksforgeeks.org/linux-unix/halt-command-in-linux-with-examples/ below:

halt command in Linux with examples

Last Updated : 11 Jul, 2025

This command in Linux is used to instruct the hardware to stop all the CPU functions. Basically, it reboots or stops the system. If the system is in

runlevel

0 or 6 or using the command with --force option, it results in rebooting of the system otherwise it results in shutdown.

Syntax:

halt [OPTION]...

Options: Option Description -f, --force It does not invoke shutdown. -w, --wtmp-only It will not call shutdown or the reboot system call but writes the shutdown record to /var/log/wtmp file. -p, --poweroff To behave as poweroff --verbose Gives verbose messages when reebooting which helps in debugging problems with shutdown. Files:

/var/log/wtmp : Consists a new runlevel record for the shutdown time.
/var/run/utmp : Gets updated by a shutdown time record when the current runlevel will be read.

Example 1:

To cease all CPU function on the system.

$halt

Output:

Broadcast message from ubuntu@ubuntu
root@ubuntu:/var/log# (/dev/pts/0) at 10:15...
The system is going down for halt NOW.

Example 2:

To power off the system using halt command.

$halt -p

Output:

Broadcast message from ubuntu@ubuntu
(/dev/pts/0) at 10:16...
The system is going down for power off NOW.

Example 3:

halt command with -w option to write shutdown record.

$halt -w

Note:

For this, there will be no output on the screen.

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