24 lines
1.1 KiB
Text
24 lines
1.1 KiB
Text
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em - the editor for mortals - is a variant of the standard Unix text
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editor - ed. It includes all of ed, so the documentation for ed is
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fully applicable to em. Em also has a number of new commands and
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facilities designed to improve its interaction and increase its
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usefulness.
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Em differs from ed in that it normally prefixes command lines with a
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'>'. For those who prefer silence, if the editor is invoked by any
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name not having 'm' as its second character, no prompts will appear.
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Other ways of controlling prompts are described below.
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The em editor was designed for display terminals and was a
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single-line-at-a-time visual editor. It was one of the first programs
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on Unix to make heavy use of "raw terminal input mode", in which the
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running program, rather than the terminal device driver, handled all
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keystrokes.
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Inspired by em, and by their own tweaks to ed, Bill Joy and Chuck
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Haley, both graduate students at UC Berkeley, took code from em to
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make en, and then "extended" en to create ex version 0.1.
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This version was translated from V6 Unix C (mid-70s era) to the
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present day by Pierre Gaston.
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