FreeBSD/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c
/*
 * zfs release [-r] <tag> <snap> ...
 *
 *	-r	Recursively release
 *
 * Release a user-hold with the given tag from the list of snapshots.
 */
zfs release [-r]  
-r      Recursively release

Release a user-hold with the given tag from the list of snapshots.
zfs release [ - r ] - r Recursively release Release a user - hold with the given tag from the list of snapshots .
static int
zfs_do_release(int argc, char **argv)
{
	return (zfs_do_hold_rele_impl(argc, argv, B_FALSE));
}
static int zfs_do_release ( int argc , char * * argv ) { return ( zfs_do_hold_rele_impl ( argc , argv , B_FALSE ) ) ; }
zfs release [-r] <tag> <snap> ...
      -r      Recursively release
zfs release [ - r ] <tag > <snap > ... - r Recursively release