v7 man page for sync

SYNC(1M)																  SYNC(1M)

NAME
       sync - update the super block

SYNOPSIS
       sync

DESCRIPTION
       Sync executes the sync system primitive.  If the system is to be stopped, sync must be called to insure file system integrity.  See sync(2)
       for details.

SEE ALSO
       sync(2), update(8)

																	  SYNC(1M)