REBOOT(8)REBOOT(8)NAMEreboot - UNIX bootstrapping procedures
SYNOPSIS
/usr/etc/reboot [ -n ] [ -q ] [ boot_command ]
DESCRIPTION
UNIX is started by placing it in memory and transferring to the entry
point. Since the system is not reenterable, it is necessary to read it
in from disk or ethernet each time it is to be bootstrapped.
Rebooting a running system. When a UNIX is running and a reboot is
desired, shutdown(8) is normally used. If there are no users then
/usr/etc/reboot can be used. Reboot causes the disks to be synced and
allows the system to perform other shutdown activities such as
resynchronizing hardware time-of-day clocks. A multi-user reboot (as
described below) is then initiated. This causes a system to be booted
and an automatic disk check to be performed. If all this succeeds
without incident, the system is then brought up for many users.
Options to reboot are:
-n Avoids the sync. It can be used if a disk or the processor is
on fire.
-q Reboots quickly and ungracefully, without shutting down running
processes first.
boot_command
Allows a new boot command to be specified. Normally the system
is rebooted using the previous boot command, but using this
option allows a new boot command to be specified without
requiring the user to halt the system and enter the new boot
command from the console.
Reboot normally logs the reboot using syslog(8) and places a shutdown
record in the login accounting file /usr/adm/wtmp. These actions are
inhibited if the -n or -q options are present.
Cold starts. The ROM monitor automatically starts the NeXT computer
when the power is turned on or when the computer is rebooted. The boot
program finds the corresponding file on the given device (odmach for an
optical drive, sdmach for a SCSI drive), loads that file into memory,
and starts the program at the entry address specified in the program
header (after clearing off the high bit of the specified entry
address).
If you want to stop the boot sequence, hold down the Command key and
press the backquote key on the numeric keypad -- the ROM monitor will
display a text window containing the "NeXT>" prompt. You can then use
the ROM monitor's boot command (b) to start the boot sequence over,
possibly specifying a different boot device.
The syntax of the b boot command is:
device[(ctrl,unit,part)][file][flags]
where device is the type of the device to be searched, ctrl is the
controller number, unit is the unit number of the disk or tape, and
part is the disk partition number. Possible values for flags are:
-a Ask for the name of the root device
-b Don't process the rc.boot file
-s Boot in single-user mode instead of multi-user mode
-i Ask for the name of the init program (the default is
/usr/etc/init)
-p Don't automatically reboot after a system panic
The following devices are supported:
sd SCSI disk drive
od optical disk drive
en ethernet
FILES
/mach system code
SEE ALSOfsck(8), halt(8), init(8), newfs(8), rc(8), shutdown(8), syslogd(8).
4th Berkeley Distribution Febuary 5, 1990 REBOOT(8)
