MPW - macintosh programmers workshop circa 1988 (when I first used it) had the notion that selections within windows could be treated as just another file. It

MPW - macintosh programmers workshop circa 1988 (when I first used it) had the notion that selections within windows could be treated as just another file. It had a lot of posix-y commands but lacked multitasking and all pipes were done via temp files, alas.