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Qed text editor

QED is a line-oriented computer text editor.

Originally written by Butler Lampson and Peter Deutsch for the SDS 940[?], probably in 1966. Ken Thompson later wrote a version for CTSS; this version was notable for introducing regular expressions. QED influenced the classic UNIX text editor ed and the less well known sam by Rob Pike. A Canadian version of QED named FRED (Friendly Editor) was written at the University of Waterloo for Honeywell GCOS systems by Peter Fraser.