haltsys(ADM)                    19 June 1992                    haltsys(ADM)


 Name

    haltsys, reboot - close out filesystems and shut down the system

 Syntax

    /etc/haltsys [ -d ]

    /etc/reboot

 Description

    The haltsys utility performs a uadmin() system call (see uadmin(S)) to
    flush out pending disk I/O, mark the filesystems as clean, and halt the
    processor.  haltsys takes effect immediately, so user processes should be
    killed beforehand.  shutdown(ADM) is recommended for normal system shut-
    down, since it warns users, terminates processes, then calls haltsys.
    Use haltsys directly only if you cannot run shutdown; for example,
    because of some system problem.

    haltsys displays a prompt indicating that the system has been shut down
    and can be rebooted or powered down.  If the -d option is used, the sys-
    tem will remain down and you are not given the option to reboot.

    The reboot command performs the same function as haltsys, except that the
    system is rebooted automatically afterwards.

    Only the super user can execute haltsys or reboot.

 Note

    haltsys locks hard disk heads.

 See also

    shutdn(S), uadmin(S), shutdown(ADM)

 Value added

    haltsys is an extension of AT&T System V provided by The Santa Cruz
    Operation, Inc.

 Credit

    reboot was developed at the University of California, Berkeley, and is
    used with permission.