Are {} "operators"? I don't think of them as such.

To me, most of the aforementioned uses are conceptually the same. Braces surround something and return its result. Syntactically there is some difference, eg if ${foo}_bar really acted like a block then the foo would be a bare word, but conceptually if you think of braces as a block which is strongly bound to whatever is to the left of the opening brace, I don't think you'll go far wrong.

In reply to Re^4: Six uses for curlies? by Anonymous Monk
in thread Six uses for curlies? by glwtta

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