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reboot

Name
     reboot - restart the operating system

Synopsis
     /usr/sbin/reboot [-dlnq] [-f | -p] [boot_arguments]


     /usr/sbin/reboot [-f [-e environment] | -p] [-dlnq] [boot_arguments]

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


     On x86 systems, when the -f flag is specified,  the  running
     kernel  will load the next kernel into memory, then transfer
     control to the newly loaded kernel. This form of  reboot  is
     shown in the second synopsis, above.


     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 systems, 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.

     -e
         If -f is present, reboot to the specified boot  environ-
         ment.

         This option is currently available only on x86 systems.


     -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 ker-
         nel.  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.

         The service svc:/system/boot-config:default  is  enabled
         by   default.  It  requires  solaris.system.shutdown  as
         action_authorization and value_authorization.  When  the
         config/fastreboot_default   property  is  set  to  true,
         reboot will behave as reboot -f. The value of this  pro-
         perty can be changed using svccfg(1M) and svcadm(1M), to
         control the default reboot behavior.

         See EXAMPLES for details.


     -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 file systems.


     -p
         Reboot to prom. This flag can be used to reboot the sys-
         tem through firmware without changing the default reboot
         behavior as  denoted  by  the  config/fastreboot_default
         property setting in system/boot-config service.

         The -p and -f options are mutually exclusive.


     -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 ker-
     nel.


       example# reboot disk1 kernel.test/unix



     Example 3 Fast Rebooting

     The following examples use the -f  option  to  perform  fast
     reboots.



     If the service  svc:/system/boot-config:default  is  enabled
     and  property  config/fastreboot_default is set to true, the
     -f option can be omitted.



     On an x86 system,  the  following  command  reboots  to  the
     default entry in the GRUB (see grub(5)) menu file menu.lst.


       example# reboot -f




     The following command reboots to another UFS root disk.


       example# reboot -f -- `/dev/dsk/c1d0s0'




     The following command reboots to another ZFS root pool.


       example# reboot -f -- `rpool/ROOT/root2'




     The following command reboots to mykernel on the  same  disk
     with -k option.


       example# reboot -f -- `/platform/i86pc/mykernel/amd64/unix -k'




     The following command reboots to mykernel off  another  root
     disk mounted on /mnt.


       example# reboot -f -- `/mnt/platform/i86pc/mykernel/amd64/unix -k'

     The        following        command        reboots        to
     /platform/i86pc/kernel/$ISADIR/unix on another boot environ-
     ment named second_root.


       example# reboot -f -e second_root




     The following command reboots to the same  kernel  with  -kv
     options.


       example# reboot -f -- `-kv'




     The following commands  disable  the  fast-reboot-by-default
     behavior.


       example# svccfg -s "system/boot-config:default" \
       setprop config/fastreboot_default=false
       example# svcadm refresh svc:/system/boot-config:default




     The following commands re-enable the  fast-reboot-by-default
     behavior.


       example# svccfg -s "system/boot-config:default" \
       setprop config/fastreboot_default=true
       example# svcadm refresh svc:/system/boot-config:default



     Example 4 Rebooting to a Particular GRUB Menu


     The following commands will reboot to entry 2  in  the  GRUB
     menu.


       example# bootadm list-menu
         the location for the active GRUB menu is: /rpool/boot/grub/menu.lst
         default 0
         timeout 10
         0 zfsbe1
         1 zfsbe1 failsafe
         2 zfsbe2
         3 zfsbe2 Solaris xVM
         4 zfsbe2 failsafe
       example# reboot 2

Files
     /var/adm/wtmpx
         login accounting file

Attributes
     See attributes(5) for descriptions of the  following  attri-
     butes:



     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE TYPEATTRIBUTE VALUE _ Availabilitysystem/core-os

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

Notes
     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.
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