Q: What is the quickest way to delete all the files in a sub-directory, plus all the files in any sub-directories inside it, and so on as deep as directories go, along with the sub-directories themselves? In other words how do you delete an entire branch of sub-directories within sub-directories without typing a lot of DEL, CD and RD commands?
A: There is no easy way for DOS to do this unassisted. The nearest any version comes is DR DOS which can delete the files, but not remove the sub-directories themselves. The relevant command is:
XDEL *.* /S
No version of MS-DOS can automatically delete files in sub-directories. To do the job in its entirety you need a third-party tree pruning utility. You can often find these in PD/shareware libraries. Alternatively, commercial disk utilities such as Xtree will do it.
Leaving aside the amazingness of not having recursive delete, I wonder why the DR-DOS folk decided to produce a command which removed the files but not the directories?