NAME

reboot − UNIX bootstrapping procedures

SYNOPSIS

/etc/reboot [ −n ] [ −q ] [ −x ]

DESCRIPTION

UNIX is started by placing it in memory at location zero and transferring to the entry point.  Since the system is not reenterable, it is necessary to read it in from disk or tape 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 /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 option 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. 

−x power-off the system. 

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. 

Power fail and crash recovery.  Normally, the system will reboot itself at power-up or after crashes.  An automatic consistency check of the file systems will be performed, and unless this fails, the system will resume multi-user operations. 

Cold starts.  A ROM monitor command must be used to boot from the default device. 
For more detail, see also “ROM monitor manual”

FILES

/vmunixsystem code
/bootsystem bootstrap
/iopbootIOP bootstrap
/rtxRTX  bootstrap

SEE ALSO

fsck(8), halt(8), init(8), newfs(8), rc(8), shutdown(8), syslogd(8)

NEWS-OSRelease 3.3