sync(8)

NAME
     sync - flush the cache to disk

SYNOPSIS
     sync

EXAMPLES

     sync                # Write out all modified cache blocks

DESCRIPTION

     MINIX maintains a cache of recently used disk blocks.  The  sync  command
     writes  any  modified  cache  blocks back to the disk.  This is essential
     before stopping the system, and should be done before running  any  a.out
     program that might crash.

SEE ALSO
     sync(2), update(8), shutdown(8).