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rmdir .command compromise file system integrity in a way thatrmdir $(pwd)orrmdir "$PWD"does not?rm *, and what do you mean by shell history? 2. The answer addressed the why part, 3. Care to elaborate?rmdir $(pwd),pwdfigures out a logical name for the current directory, for instance/foo/bar/baz, and thenrmdir, seeing that path, removes thebazentry from the/foo/bardirectory, provided the conditions are met. This makes sense. The commandrmdir ., on the other hand, is an instruction to remove the.entry from the current directory, which is neither allowed (it would violate the constraint that every directory has a.entry pointing to itself) nor useful (it wouldn't remove the link you wanted removed).