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<h3 class="section" id="Font-Directories-1">2.4 Font Directories</h3>
<a class="index-entry-id" id="index-font-directories"></a>
<a class="index-entry-id" id="index-directories-for-fonts"></a>
<a class="index-entry-id" id="index-searching-fonts"></a>
<a class="index-entry-id" id="index-fonts_002c-searching"></a>
<p><code class="code">groff</code> enforces few restrictions on how font description files are
named. For its family/style mechanism to work (see <a class="pxref" href="Font-Families.html">Font Families</a>),
the names of fonts within a family should start with the family name,
followed by the style. For example, the Times family uses ‘<samp class="samp">T</samp>’ for
the family name and ‘<samp class="samp">R</samp>’, ‘<samp class="samp">B</samp>’, ‘<samp class="samp">I</samp>’, and ‘<samp class="samp">BI</samp>’ to
indicate the styles ‘roman’, ‘bold’, ‘italic’, and ‘bold italic’,
respectively. Thus the final font names are ‘<samp class="samp">TR</samp>’, ‘<samp class="samp">TB</samp>’,
‘<samp class="samp">TI</samp>’, and ‘<samp class="samp">TBI</samp>’.
</p>
<a class="index-entry-id" id="index-font-path"></a>
<a class="index-entry-id" id="index-path_002c-for-font-files"></a>
<p>Font description files are kept in <em class="dfn">font directories</em>, which
together constitute the <em class="dfn">font path</em>. The search procedure
always appends the directory <code class="code">dev</code><var class="var">name</var>, where <var class="var">name</var> is
the name of the output device. Assuming TeX DVI output, and
<samp class="file">/foo/bar</samp> as a font directory, the font description files for
<code class="command">grodvi</code> must be in <samp class="file">/foo/bar/devdvi</samp>.
Each directory in the font path is searched in the following order until
the desired font description file is found or the list is exhausted.
</p>
<ul class="itemize mark-bullet">
<li>Directories specified with GNU <code class="code">troff</code>’s or <code class="code">groff</code>’s
<samp class="option">-f</samp> command-line option. All output drivers (and some
preprocessors) support this option as well, because they require
information about the glyphs to be rendered in the document.
</li><li><a class="index-entry-id" id="index-GROFF_005fFONT_005fPATH_002c-environment-variable-1"></a>
Directories listed in the <code class="env">GROFF_FONT_PATH</code> environment variable.
</li><li><a class="index-entry-id" id="index-site_002dlocal-directory-1"></a>
<a class="index-entry-id" id="index-directory_002c-site_002dlocal-1"></a>
A site-local directory and the main font description directory.
The locations corresponding to your installation are listed in section
“Environment” of <cite class="cite">gtroff<span class="r">(1)</span></cite>. If not otherwise configured,
they are as follows.
<div class="example">
<div class="group"><pre class="example-preformatted">/usr/local/share/groff/site-font
/usr/local/share/groff/1.23.0/font
</pre></div></div>
<p>The foregoing assumes that the version of <code class="code">groff</code> is 1.23.0, and
that the installation prefix was <samp class="file">/usr/local</samp>. It is possible to
fine-tune these locations during the source configuration process.
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