Okay, so basically, whatever's in the braces is treated as a comma
separated array of strings and whatever string the braces are part of
gets duplicated for each entry in the array... and if their are
multiple sets of braces, a test I just did suggests the expansion
covers the entire Cartesian product... at least,
mkdir [1,2,3}test{1,2,3}
generated 9 folders...
Is there a way to define a range? I tried:
mkdir {a-z}{0-9}
But that seems to get interpreted literally, creating a folder named {a-z}{0-9}.
Still, even without a way to handle ranges, this sounds like a very
useful trick and and easy to remember one to boot.
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