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(web2c.info)Path searching

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Path searching
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  All of the Web2c programs, including TeX, which do path searching use
the Kpathsea routines to do so.  The precise names of the environment
and configuration file variables which get searched for particular file
formatted are therefore documented in the Kpathsea manual (Note:
Supported file formats.).  Reading
`texmf.cnf' (Note: Config files.), invoking
`mktex...' scripts (Note: mktex scripts.), and
so on are all handled by Kpathsea.

  The programs which read fonts make use of another Kpathsea feature:
`texfonts.map', which allows arbitrary aliases for the actual names of
font files; for example, `Times-Roman' for `ptmr8r.tfm'.  The
distributed (and installed by default) `texfonts.map' includes aliases
for many widely available PostScript fonts by their PostScript names.