QED is a line-oriented computer text editor.
Originally written by Butler Lampson and L. 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.
See also: QED for other uses of "QED".
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