Tex is an actively used programming language created in 1978. TeX ( or , see below), stylized within the system as TeX, is a typesetting system (or "formatting system") designed and mostly written by Donald Knuth and released in 1978. Together with the Metafont language for font description and the Computer Modern family of typefaces, TeX was designed with two main goals in mind: to allow anybody to produce high-quality books using minimal effort, and to provide a system that would give exactly the same results on all computers, at any point in time. TeX is free software, which made it accessible to a wide range of users. Read more on Wikipedia...

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Example code from the Hello World Collection:

% Hello World in plain \TeX
\immediate\write16{Hello World!}
\end

Example code from Linguist:

\ProvidesFile{verbose.bbx}
[\abx@bbxid]

\RequireBibliographyStyle{authortitle}

\endinput

Example code from Wikipedia:

The quadratic formula is $$-b \pm \sqrt{b^2 - 4ac} \over 2a$$
\bye

Last updated July 8th, 2019