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 STY (pronounced "sty", not spelled out) n. A
       pseudo-teletype, which is a two-way pipeline with a job on one end and
       a fake keyboard-tty on the other. Also, a standard program which
       provides a pipeline from its controlling tty to a pseudo-teletype (and
       thence to another tty, thereby providing a "sub-tty"). This
       is MIT terminology; the SAIL and DEC equivalent is PTY.