$home/manuals/unix_v8/8/update

UPDATE(8)                   System Manager's Manual                  UPDATE(8)

NAME
       update - periodically update the super block

SYNOPSIS
       /etc/update

DESCRIPTION
       Update  is  a program that executes the sync(2) primitive every 30 sec‐
       onds.  This insures that the file system is fairly up to date  in  case
       of  a  crash.  This command should not be executed directly, but rather
       out of the initialization shell command file rc(8).

SEE ALSO
       sync(2), sync(8), init(8)

                                                                     UPDATE(8)