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Thalia Archibald's blog Curly braces: An evolution of UNIX and C 19 May 2026 How were { } curly braces typed with a Teletype Model 33 on UNIX? These characters are especially important for C, but absent on this terminal. I was just asked a similar question 1 and in response, this is a tour of the coevolution of UNIX and C, from this perspective, featuring “hello, world” through the ages. This work