Among open source documentation, you will sometimes come across .tex files, which are usually LaTeX files. TeX is a markup-based typesetting system developed by Donald Knuth, and LaTeX is a widely used set of macros for TeX. If you need to create printable output from a LaTeX file that is not present, the command latex file.tex creates a .dvi file (see the previous section). This can be converted to PostScript with dvips file.dvi.
LaTeX is a wonderful way of making very attractive printed output, especially for typesetting mathematics, but there is a learning curve.
j f - - r The DVI file viewers and the TeX and LaTeX tools are not installed by default.
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