reboot(1M) System Administration Commands reboot(1M)NAMEreboot - restart the operating system
SYNOPSIS
/usr/sbin/reboot [-dlnq] [boot_arguments]
DESCRIPTION
The reboot utility restarts the kernel. The kernel is loaded into mem‐
ory 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. On x86 sys‐
tems, reboot may also update the boot archive as needed to ensure a
successful reboot.
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.
OPTIONS
The following options are supported:
-d Force a system crash dump before rebooting. See dumpadm(1M) for
information on configuring system crash dumps.
-f For x86 systems:
Fast reboot, bypassing firmware and boot loader. The new kernel
will be loaded into memory by the running kernel, and control
will be transferred to the newly loaded kernel. If disk or kernel
arguments are specified, they must be specified before other boot
arguments.
For SPARC systems:
Speeds up rebooting by skipping some POST tests.
-l Suppress sending a message to the system log daemon, syslogd(1M)
about who executed reboot.
-n 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.
-q Quick. Reboot quickly and ungracefully, without shutting down
running processes first.
OPERANDS
The following operands are supported:
boot_arguments
An optional boot_arguments specifies arguments to the uadmin(2)
function that are 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 the arguments are specified,
whitespace between them is replaced by single spaces unless the
whitespace is quoted for the shell. 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.
EXAMPLES
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.
example# reboot disk1 kernel.test/unix
FILES
/var/adm/wtmpx login accounting file
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWcsu │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmdb(1), boot(1M), dumpadm(1M), fsck(1M), halt(1M), init(1M), ker‐
nel(1M), shutdown(1M), sync(1M), syslogd(1M), sync(2), uadmin(2),
reboot(3C), attributes(5)NOTES
The reboot utility does not execute the scripts in /etc/rcnum.d or exe‐
cute shutdown actions in inittab(4). To ensure a complete shutdown of
system services, use shutdown(1M) or init(1M) to reboot a Solaris sys‐
tem.
SunOS 5.10 25 Feb 2011 reboot(1M)
