SysIII/usr/src/man/man1/shutdown.1m

.TH SHUTDOWN 1M
.SH NAME
shutdown \- terminate all processing
.SH SYNOPSIS
.B /etc/shutdown
.SH DESCRIPTION
.I Shutdown\^
is part of the
.SM UNIX
operation procedures.
Its
primary function is to terminate all currently running processes
in an orderly and cautious manner.
The procedure is designed to interact with the operator
(i.e., the person who invoked
.IR shutdown ).
.I Shutdown\^
may instruct the operator to perform some
specific tasks, or to supply certain responses before execution
can resume.
.I Shutdown\^
goes through the following steps:
.TP 3
-
All users logged on the system are notified to log off the system
by a broadcasted message. The operator may display his/her own
message at this time. Otherwise, the standard file save message
is displayed.
.TP 3
-
If the operator wishes to run the file-save procedure,
.I shutdown\^
unmounts all file systems.
.TP 3
-
All file systems' super blocks are updated before the system is to
be stopped (see
.IR sync (1M)).
This must be done before re-booting the system,
to insure file system integrity.
.sh DIAGNOSTICS
The most common error diagnostic that will occur is
.IR "device busy" .
This diagnostic happens when a particular file system could not
be unmounted.
See
.IR umount (1M).
.SH SEE ALSO
sync(1M), umount(1M).