<tool, text> An early kind of text editor suited to use on a
teletype. The user enters editing commands which apply to the
current line or some given range of lines. These include moving
forward and backward through the buffer, inserting and deleting
lines, substituting a string for a pattern match, and printing
lines. Visual feedback is restricted to explicitly requesting
the display of one or more lines, in contrast to a screen
editor. ed is Unix's line editor. Try this search on Wikipedia,
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