2.4 Font Directories
Basically, there is no restriction how font files for `groff' are named
and how long font names are; however, to make the font family mechanism
work (Note: Font Families), fonts within a family should start with
the family name, followed by the shape. For example, the Times family
uses `T' for the family name and `R', `B', `I', and `BI' to indicate
the shapes `roman', `bold', `italic', and `bold italic', respectively.
Thus the final font names are `TR', `TB', `TI', and `TBI'.
All font files are kept in the "font directories" which constitute
the "font path". The file search functions always append the directory
`dev'NAME, where NAME is the name of the output device. Assuming, say,
DVI output, and `/foo/bar' as a font directory, the font files for
`grodvi' must be in `/foo/bar/devdvi'.
The elements of the search path for font files are (in that order):
* The directories specified with `gtroff''s or `groff''s `-F'
command line option. All device drivers and some preprocessors
also have this option.
* The directories given in the `GROFF_FONT_PATH' environment
* A site-specific directory and the main font directory; the default
assuming that the version of `groff' is 1.20.1, and the
installation prefix was `/usr/local'. It is possible to fine-tune
those directories during the installation process.
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