loop through directory names using a batch file?

Assume I have this structure:

d:/
-- /alpha/
-- /beta/
-- /gamma/
-- /delta/


I'm trying to execute a batch file that goes through those folders (but not through sub-folders within them).

How do I get this result using a FOR LOOP (assuming I don't know the name and quantity of the folders):

ren alpha alpha1
ren beta beta1
ren gamma gamma1
ren delta delta1

This is all you should need -- directly at the command prompt:

for /D %i in (*) do rename "%i" "%i1"

or in a batch file (note the doubled `%`):

for /D %%i in (*) do rename "%%i" "%%i1"

The **/D** performs the command against the directory names, as per the help, which can be obtained using the command `for /?`

> If Command Extensions are enabled, the following additional forms of
> the FOR command are supported:
>
> FOR /D %variable IN (set) DO command [command-parameters]
>
> If set contains wildcards, then specifies to match against directory
> names instead of file names.