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update(8)
NAME
  update - Periodically updates the superblock

SYNOPSIS
  /sbin/update

DESCRIPTION
  The update command executes a sync system call every 30 seconds.  This
  ensures that the file system is up to date in the event of a system crash.
  This command is provided as a statically-linked executable in /sbin.

  The cron program also provides the functionality of the update command.
  The update shell script typically provides the following functionality:

       #!/bin/sh
       while true
       do
	   sync
	   sleep 30
       done &
       exit 0

FILES
  /sbin/update
	    Specifies the command path

RELATED INFORMATION
  Commands:  cron(8), init(8), sync(8)

  Functions:  sync(2)