1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.roff% 5.\" 6.\" @(#)reboot.8 5.2 (Berkeley) 10/30/91 7.\" 8.Dd 9.Dt REBOOT 8 10.Os 11.Sh NAME 12.Nm reboot , 13.Nm halt 14.Nd 15stopping and restarting the system 16.Sh SYNOPSIS 17.Nm halt 18.Op Fl nq 19.Nm reboot 20.Op Fl nq 21.Sh DESCRIPTION 22The 23.Nm halt 24and 25.Nm reboot 26utilities flush the file system cache to disk, send all running processes 27a SIGTERM (and subsequently a SIGKILL) and, respectively, halt or restart 28the system. 29The action is logged, including entering a shutdown record into the login 30accounting file. 31.Pp 32The options are as follows: 33.Bl -tag -width Ds 34.It Fl n 35If the 36.Fl n 37option is specified, 38the file system cache is not flushed. 39This option should probably not be used. 40.It Fl q 41If the 42.Fl q 43option is specified, 44the system is halted or restarted quickly and ungracefully, and only 45the flushing of the file system cache is performed. 46This option should probably not be used. 47.El 48.Pp 49Normally, the 50.Xr shutdown 8 51utility is used when the system needs to be halted or restarted, giving 52users advance warning of their impending doom. 53.Sh SEE ALSO 54.Xr sync 1 , 55.Xr utmp 5 , 56.Xr boot 8 , 57.Xr shutdown 8 58.Sh HISTORY 59The 60.Nm 61command is 62.Ud . 63