Unidentified subject!

What is the best way to get the equivalent of the DOS command 
"dir /ad" in linux?  That command will show just the (sub)directories 
and not ordinary files.

I thought that "ls -d" would be the equivalent but it is not. 

I know I can do "ls -f | grep /" to get the directory, but putting it
into a script like this fails because the / does not appear when the
output of ls is redirected:
-----------------------------------
#!/bin/sh
if [ ! -z "$1" ]
then
	WAAR=$1
else
	WAAR=.
fi
ls -f $WAAR | grep /
----------------------------------

The following script works:
-----------------------------
#!/bin/sh
if [ ! -z "$1" ]
then
	WAAR=$1
else
	WAAR=.
fi
ls -la $WAAR | grep ^d
-----------------------------

Is there another way of doing this?
Johann
-- 
J.H. Spies - Tel. 082 782 0336.  Posbus 4668, Tygervallei 7536
     "But seek ye first the kingdom of God, and his  
      righteousness; and all these things shall be added 
      unto you."     Matthew 6:33