UPDATE(8) System Manager's Manual UPDATE(8)
update - periodically update the super block
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 should
be executed out of the initialization shell command file.
sync(1), sync(2), init(8)
9 September 1987 UPDATE(8)