[expert] Changing case or extensions

[Gary Bunker]

I used to know how to do this, but now my brain is full.

How can I change the case, or extension of a lot of files at once.  For
example, I have a directory of BMPs that a friend sent from his digital
camera (yeah, I know, bad format, but it's not me).  I want to make
them all bmp instead of BMP extensions.  I can't remember how, although
I recall it was something simple.

Thanks
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