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Commonalities
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  Many aspects of the TeX system are the same among more than one
program, so we describe all those pieces together, here.

Option conventions

Order doesn't matter, -- or -, = or ` ' for values.

Common options

--help --version --verbose, and TeX/MF/MP options.

Path searching

Features of the common path searching library.

Output file location

TEXMFOUTPUT allows output in places other than `.'.

Three programs

TeX, Metafont, and MetaPost have a lot in common.