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To navigate thru the directories (folders) use CD as in:

CD \WINDOWS

To change to a different drive, just enter the name of the drive:

C:

While ERASE will erase a file, most people use the synonym DEL.

To make a new directory (let's call it newdir) the command is MD:

MD newdir

To delete a directory the command is DELTREE. It will also delete all files in the directory and all subdirectories.

To see the files in a directory:

DIR /P

You only need the /P if there are more than 20 files.