update \- periodically update the super block
is a program that executes
primitive every 30 seconds.
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(2), sync(1), init(8)
a file system can be damaged.
This is partially due to DEC hardware that
writes zeros when NPR requests fail.
temporarily increment the system time by at
least 30 seconds to trigger the execution of
This would give 30 seconds grace to halt the CPU.