(15-03-2021, 07:57 PM)Ramiferous Wrote: So are the curly brackets necessary? seems to work without them.

Not sure if this is what you're asking about, but:


and


generate the same list of files, although the syntax used to describe the pattern to be matched is slightly different. The bracketed notation is just a compact way to say either file extension will do.

It's a handy way to avoid retyping the common elements of two or more arguments. E.g.,


expands to


Apologies if I've misunderstood your question and explained something you already knew!