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System Administration Commandsreboot(1M)


 reboot - restart the operating system


 /usr/sbin/reboot [-dlnq] boot_arguments



The reboot utility restarts the kernel. The kernel is loaded into memory by the PROM monitor, which transfers control to the loaded kernel.

Although reboot can be run by the super-user at any time, shutdown(1M) is normally used first to warn all users logged in of the impending loss of service. See shutdown(1M) for details.

The reboot utility performs a sync(1M) operation on the disks, and then a multi-user reboot is initiated. See init(1M) for details.

The reboot utility normally logs the reboot to the system log daemon, syslogd(1M), and places a shutdown record in the login accounting file /var/adm/wtmpx. These actions are inhibited if the -n or -q options are present.

Normally, the system reboots itself at power-up or after crashes.


Force a system crash dump before rebooting. See dumpadm(1M) for information on configuring system crash dumps.
Suppress sending a message to the system log daemon, syslogd(1M) about who executed reboot.
Avoid calling sync(2) and do not log the reboot to syslogd(1M) or to /var/adm/wtmpx. The kernel still attempts to sync filesystems prior to reboot, except if the -d option is also present. If -d is used with -n, the kernel does not attempt to sync filesystems.
Quick. Reboot quickly and ungracefully, without shutting down running processes first.


An optional boot_arguments string can be used to specify arguments to the uadmin(2) function that will be passed to the boot program and kernel upon restart. The form and list of arguments is described in the boot(1M) and kernel(1M) man pages. If multiple arguments are specified, they must be quoted for the shell, as shown in the EXAMPLES section. If the boot_arguments begin with a hyphen, they must be preceded by the -- delimiter (two hyphens) to denote the end of the reboot argument list.


 Example 1. Passing the r and v Arguments to boot

In the following example, the delimiter `--' (two hyphens) must be used to separate the options of reboot from the arguments of boot(1M).

example# reboot -dl -- -rv

Example 2. Rebooting Using a Specific Disk and Kernel

The following example reboots using a specific disk and kernel. Note that multiple boot arguments are quoted.

example# reboot "disk1 kernel.test/unix"


login accounting file



See attributes(5) for descriptions of the following attributes:




mdb(1), boot(1M), dumpadm(1M), fsck(1M), halt(1M), init(1M), kernel(1M), shutdown(1M), sync(1M), syslogd(1M), sync(2), uadmin(2), reboot(3C), attributes(5)



The reboot utility does not execute the scripts in /etc/rcnum.d or execute shutdown actions in inittab(4). To ensure a complete shutdown of system services, use shutdown(1M) or init(1M) to reboot a Solaris system.

SunOS 5.9Go To TopLast Changed 4 Jun 2001

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.