1.\" Copyright (c) 1980, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)halt.8 6.5 (Berkeley) 03/16/91 7.\" 8.Dd 9.Dt HALT 8 10.Os BSD 4 11.Sh NAME 12.Nm halt 13.Nd stop the processor 14.Sh SYNOPSIS 15.Nm halt 16.Op Fl n 17.Op Fl q 18.Op Fl y 19.Sh DESCRIPTION 20.Nm Halt 21writes out sandbagged information to the disks and then stops 22the processor. The machine does not reboot, even if the auto-reboot 23switch is set on the console. 24.Pp 25Available options for 26.Nm halt : 27.Bl -tag -width Ds 28.It Fl n 29No sync before stopping. 30.It Fl q 31Quick halt, no graceful shutdown is attempted. 32.It Fl y 33This option is needed if you are trying to halt the system from a dialup. 34.El 35.Pp 36.Nm Halt 37normally logs the shutdown using 38.Xr syslog 8 39and places a shutdown record in the login accounting file 40.Pa /var/log/wtmp. 41These actions are inhibited if the 42.Fl n 43or 44.Fl q 45options are present. 46.Sh SEE ALSO 47.Xr reboot 8 , 48.Xr shutdown 8 , 49.Xr syslogd 8 50.Sh BUGS 51It is very difficult to halt a 52.Tn VAX , 53as the machine wants to then 54reboot itself. A rather tight loop suffices. 55.Sh HISTORY 56The 57.Nm 58command appeared in 59.Bx 4.0 . 60