NAME

update − periodically update the super block

SYNOPSIS

update [ interval ]. 

DESCRIPTION

Update is a program that executes the sync(2) primitive every 30 seconds. This insures that the file system is fairly up to date in case of a crash.

If the parameter interval is given, it is used instead of 30 for the timing interval.  This command should not be executed directly, but should be executed out of the initialization shell command file, rc (8). 

SEE ALSO

sync(2), sync(1), init(8)

7th Edition