halt(8)halt(8)NAMEhalt - Stops the processor
SYNOPSIS
/usr/sbin/halt [-d] [-l] [-n] [-q] [-y]
OPTIONS
Generates a crash dump of the system before halting it. Can be used
with any other option. Does not log the halt using syslog. Prevents
the sync before stopping, and does not log the halt using syslog.
Causes a quick halt, does not log the halt using syslog, and makes no
attempt to kill all processes. Halts the system from a dial-up opera‐
tion.
DESCRIPTION
If other users are logged into the system, or if the system is operat‐
ing at a multiuser run level, use the /usr/sbin/shutdown -h command to
halt the system. If only the root user is logged in, and you do not
plan to restart the system immediately, use the halt command.
The halt command writes data to the disks and then stops the proces‐
sor(s), but does not reboot the machine.
You must be the root user to run this command.
When the system displays the message, you can turn off power to the
machine.
If the command is invoked without the -l, -n, or -q option, the halt
program logs the shutdown using the syslogd command and places a record
of the shutdown in the login accounting file, /var/adm/wtmp. Using the
-q and the -n options imply the -l option.
EXAMPLES
To halt the system without logging the shutdown in the log file, enter:
halt-l To halt the system quickly, enter: halt-q To halt the system
quickly, also leaving a crash dump for the savecore command, enter:
halt-d -q To halt the system from a dial-up, enter: halt-y
FILES
Specifies the command path. Specifies the syslog daemon. Specifies
the login accounting file.
SEE ALSO
Commands: fasthalt(8), reboot(8), savecore(8), shutdown(8), syslogd(8)
Functions: reboot(2), sync(2), syslog(3)halt(8)