Troff is a text markup language created in 1973.
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troff is the major component of a document processing system developed by AT&T Corporation for the Unix operating system. troff features commands to designate fonts, spacing, paragraphs, margins, footnotes and more. Unlike many other text formatters, troff can position characters arbitrarily on a page, even overlapping them, and has a fully programmable input language. Read more on Wikipedia...
\" "Hello, world!" in troff Hello, world!
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