/ (switches) in Windows don't have any filter purposes.
I know in Linux it is
At a Windows command prompt, how can I show only Directories and not Files?
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This is done by filtering by attributes.
dir [somedir] /ad will show all entries with the "directory" attribute. It also shows junction points.
Displays a list of files and subdirectories in a directory. DIR [drive:][path][filename] [/A[[:]attributes]] [/B] [/C] [/D] [/L] [/N] [/O[[:]sortorder]] [/P] [/Q] [/R] [/S] [/T[[:]timefield]] [/W] [/X] [/4] [drive:][path][filename] Specifies drive, directory, and/or files to list. /A Displays files with specified attributes. attributes D Directories R Read-only files H Hidden files A Files ready for archiving S System files I Not content indexed files L Reparse Points - Prefix meaning not
From Microsoft's TechNet - Dir:
If you use /a without specifying Attributes, dir displays the names of all files, including hidden and system files.
The following list describes each of the values that you can use for Attributes. Using a colon (:) is optional. Use any combination of these values, and do not separate the values with spaces.
h Hidden files
s System files
l Reparse points
r Read-only files
a Files ready for archiving
i Not content indexed files
- Prefix meaning "not"