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Here is a line of code which deletes all files in the current directory: As far as I know, means delete, means the current directory.
What does means?

That should be just another name in the list of files to be deleted, so it deletes a file called "DR" within the current directory.
I don't see any benefit adding that to a list of filenames that contains all files in the current directory (".") which covers the file "DR".

penpen

Or it's a typo and /AR was actually meant. In that case only files with the "read only" attribute would have been deleted.

Steffen