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<?xml version="1.0" encoding="iso-8859-1" ?>
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<head><title>Modify</title>
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<a
href="mn-port.html#mn33.html" >exit Modify</a>
<h3 class="SubSectionHead"><a
name="QQ1-33-42"></a>The Composition of tex4ht.env</h3>
<a
name="index33-42001"></a>TeX4ht consults this file for system-dependent information. The file consists of a sequence of directives, where
each directive occupies a line and is identified with a distinguished character code in the first column. The following
are the possible character codes and their meaning.
<dl >
<dt>b</dt><dd>
This character identifies for <span class="cmtt-10">tex4ht </span>a comment to be placed in the ‘<span class="cmtt-10">.lg</span>’ file, before the <a
href="mn37.html#bsc" name="bsc-1">scripts</a> for creating pictures
for symbols.
</dd><dt>g</dt><dd>
<a
name="index33-42002"></a>This character identifies the extension tex4ht should associate to names of the files of pictures it creates. The default
corresponds to a setting of the form ‘<span class="cmtt-10">g.gif</span>’.
<!--l. 5528--><p class="indent"> A directory name can also be encoded into tex4ht during compilation time through the variable
<a
href="mn36.html#x-LGTYP" name="LGTYP">LGTYP</a>.
</p><!--l. 5532--><p class="indent"> Alternatively, an extension can be provided in the command line of tex4ht, in which case the character code
should be present and immediately preceded by a ‘<span class="cmtt-10">-</span>’ character.
</p>
</dd><dt>i</dt><dd>
This character identifies to <span class="cmtt-10">tex4ht </span>a directory <a
href="mn39.html#ch-i" name="ch.i">where</a> the hypertext font (.htf) files of <span class="cmtt-10">tex4ht </span>are
stored.
</dd><dt>l</dt><dd>
<a
name="index33-42003"></a>This character identifies a <a
href="mn34.html" name="mn34.html" >bookkeeping file</a> where <span class="cmtt-10">tex4ht </span>can record information about paths to files it uses.
</dd><dt>s</dt><dd>
This character identifies to <span class="cmtt-10">tex4ht </span>a <a
href="mn37.html#sc" name="sc-1">command</a> for requesting in the <span class="cmtt-10">lg </span>file the translation of dvi pictures to
bitmaps. When needed, a sequence of such commands can be placed in consecutive lines to form a block of
commands for handling the translation.
</dd><dt>t</dt><dd>
<a
name="index33-43005"></a>This character identifies to <span class="cmtt-10">tex4ht </span>the directory <a
href="mn35.html" name="mn35.html" >where</a> the font metric (.tfm) files of TeX are stored.
</dd><dt>A</dt><dd>
This character identifies to <span class="cmtt-10">t4ht </span>a <a
href="mn-unix.html#accscript">script</a> for changing access mode of files.
</dd><dt>C</dt><dd>
This character identifies a <a
href="mn-unix.html#mvscript">script</a> for satisfying requests made in the <span class="cmtt-10">lg </span>file to copy files between directories.
</dd><dt>E</dt><dd>
This character identifies a <a
href="mn-unix.html#mvscript">script</a> for satisfying requests made in the <span class="cmtt-10">lg </span>file to get substitutions for empty
pictures.
</dd><dt>F</dt><dd>
This character identifies to <span class="cmtt-10">t4ht </span>a <a
href="mn-unix.html#dv2gif">script</a> for translating into other formats characters from dvi files.
</dd><dt>G</dt><dd>
This character identifies to <span class="cmtt-10">t4ht </span>a <a
href="mn-unix.html#dv2gif">script</a> for translating general dvi figures into other formats.
</dd><dt>M</dt><dd>
This character identifies a <a
href="mn-unix.html#mvscript">script</a> for satisfying requests made in the <span class="cmtt-10">lg </span>file to move files between directories.
</dd><dt>S</dt><dd>
This character specifies what security measures <span class="cmtt-10">t4ht </span>should take when invoking other utilities. In the absence of
this directive, all the calls to system services are ignored. On the other hand, a directive of the form ‘<span class="cmtt-10">S*</span>’ allows all
system calls. A selective access to system calls can be obtained with <span class="cmtt-10">S </span>directives, which specify the prefixes of
command names that should be allowed to go through.
<!--l. 5757--><p class="indent"> The <span class="cmtt-10">S </span>directives can be fed as switches to the command lines <span class="cmtt-10">t4ht</span>.
</p>
</dd><dt>P</dt><dd>
A variant of he <span class="cmtt-10">S </span>switch for <span class="cmtt-10">tex4ht</span>. Rarely useful.
</dd><dt>X</dt><dd>
This character identifies to <span class="cmtt-10">t4ht </span>a script for postprocessing the files which <span class="cmtt-10">tex4ht </span>outputs. The file names are
represented by ‘<span class="cmtt-10">%%1</span>’, and their extensions by ‘<span class="cmtt-10">%%2</span>’. Such scripts, for instance, may invoke validators to check the
correctness of the files against given DTD’s and request XSL transformations.
<!--l. 5770--><p class="indent"> The command line of <span class="cmtt-10">t4ht </span>may include a flag ‘<span class="cmtt-10">-X</span>’ whose content is represented by ‘<span class="cmtt-10">%%3</span>’ in the
script.
</p><!--l. 5774--><p class="indent"> Example: <span class="cmtt-10">Xmake -f mymake name=%%1 ext=%%2 %%3</span>
</p>
</dd><dt><span class="cmbx-10">. </span>(dot)</dt><dd>
A variant of the X script applied to files whose extension names are provided after the dot. The file names are
represented by ‘<span class="cmtt-10">%%1</span>’, and the jobnames by ‘<span class="cmtt-10">%%0</span>’.
<!--l. 5780--><p class="indent"> Example: <span class="cmtt-10">.xml echo "name=%%1.xml"</span>
</p>
</dd><dt><span class="cmtt-10"><</span></dt><dd>
Tagged script segments <span class="cmtt-10"><tag>...</tag> </span>are scanned only if their names are specified within <span class="cmtt-10">-ctag </span>switches of
<span class="cmtt-10">tex4ht.c </span>and <span class="cmtt-10">t4ht.c</span>. When such switches are not supplied, a the switch <span class="cmtt-10">-cdefault </span>is implicitly
assumed.
</dd></dl>Lines starting with other characters are treated as comments, and empty lines may be treated as file
terminators by <span class="cmtt-10">tex4ht </span>and <span class="cmtt-10">t4ht</span>.
<!--l. 5796--><p class="noindent"><span class="cmbx-10">Examples: </span><a
href="tex4ht-env-unix.txt" >Unix-oriented</a>, <a
href="tex4ht-env-win32.txt" >MS-oriented</a>
</p>
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