halt Command in Linux
NAME
halt - reboot or stop the system
SYNOPSIS
halt [OPTION]...
DESCRIPTION
These programs allow a system administrator to reboot, halt or poweroff the system.
When called with --force or when in runlevel 0 or 6, this tool invokes the reboot system call itself and directly reboots the system. Otherwise this simply invokes the shutdown tool with the appropriate arguments.
Options
| Tag | Description |
|---|---|
| -f, --force | Does not invoke shutdown and instead performs the actual action you would expect from the name. |
| -p, --poweroff | Instructs the halt command to instead behave as poweroff. |
| -w, --wtmp-only | Does not call shutdown or the reboot system call and instead only writes the shutdown record to /var/log/wtmp |
| --verbose | Outputs slightly more verbose messages when rebooting, useful for debugging problems with shutdown. |
EXAMPLES
Example-1:
The halt command will cease all CPU function on the system. On most systems, this will drop you into single-user mode and then power off the machine:
$ halt
output:
Broadcast message from ubuntu@ubuntu
root@ubuntu:/var/log# (/dev/pts/0) at 7:38 ...
The system is going down for halt NOW!
Example-2:
To poweroff system using halt command, use -p option
$ halt -p
output:
Broadcast message from ubuntu@ubuntu
(/dev/pts/0) at 17:54 ...
The system is going down for power off NOW!
Example-3:
To write shutdown record to /var/log/wtmp, use -w option.
$ halt -w
output:
no output on screen, record will be written to /var/log/wtmp