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Originally posted by devnul
Or maybe something with POSIX, I dunno... I'm just rambling....
I got curious so I did some digging on Usenet, and came up with a similar thread on comp.unix.questions. The ultimate answer to that thread was that it is part of the POSIX.2 standard. All builtins must also exist as scripts or binaries in the filesystem. They do not have to do anything, but they must exist. The logic behind this requirement is still a mystery, but hopefully we can close this thread now...