System Administration Commands reboot(1M) NAME reboot - restart the operating system SYNOPSIS /usr/sbin/reboot [-dlnq] [-f [dryrun] [-e BE]] [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 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 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 environment (BE) as specified by live_upgrade(5). -f 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 loaded kernel. If disk or kernel arguments are specified, they must be specified before other boot arguments. When -f is present, reboot(1M) accepts a special argument "dryrun" to check whether all the drivers in the system have implemented quiesce(9E). Currently only available on x86 system. See Example 3 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 filesystems. SunOS 5.11 Last change: 11 Apr 2005 1 System Administration Commands reboot(1M) -q Quick. Reboot quickly and ungracefully, without shut- ting down running processes first. OPERANDS The following operands are supported: boot_arguments An optional boot_arguments specifies argu- ments 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 speci- fied, 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 reboot Check if all the drivers on the system are fast reboot capable. example# reboot -f dryrun Rebooting to another UFS root disk. example# reboot -f -- '/dev/dsk/c1d0s0' Rebooting to another ZFS root pool. example# reboot -f -- 'rootpool/root1' Rebooting to "mykernel" on the same disk with "-k" option. example# reboot -f -- '/platform/i86pc/mykernel/amd64/unix -k' Rebooting to "mykernel" off another root disk mounted on /mnt. example# reboot -f -- '/mnt/platform/i86pc/mykernel/amd64/unix -k' Rebooting to "/platform/i86pc/kernel/$ISADIR/unix" on another boot environment named "second_root". example# reboot -f -e second_root Rebooting to the same kernel with "-kv" options. example# reboot -f -- '-kv' FILES /var/adm/wtmpx login accounting file ATTRIBUTES SunOS 5.11 Last change: 11 Apr 2005 2 System Administration Commands reboot(1M) See attributes(5) for descriptions of the following attri- butes: ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWcsu | |_____________________________|_____________________________| SEE ALSO 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) 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. SunOS 5.11 Last change: 11 Apr 2005 3