Ubuntu Manpage: latex2html - translate LaTeX files to HTML (HyperText Markup Language)

Provided by: latex2html_2008-debian1-10_all

NAME

       latex2html - translate LaTeX files to HTML (HyperText Markup Language)

SYNOPSIS

       latex2html [options] [target [target ...]]

DESCRIPTION

       This  manual page explains the LaTeX2HTML utility, which is a Perl program that translates
       LaTeX document into HTML format. For each source file given as an argument the  translator
       will create a directory containing the corresponding HTML files. For details and examples,
       please consult the online html documentation, a copy  of  which  should  be  available  in
       /usr/share/doc/latex2html/manual.ps.gz or /usr/share/doc/latex2html/html/

CAVEAT

       This documentation has been derived from the TeX manual, and may not be up to date. Please
       refer to the online manual for authoritative documentation.

Options controlling Titles, File-Names and Sectioning

-t <top-page-title>
Same as setting: $TITLE = <top-page-title> ; Name the document using this title.

-short_extn
Same as setting: $SHORTEXTN = 1; Use a filename prefix of .htm for the produced
HTML files. This is particularly useful for creating pages to be stored on CD-ROM
or other media, to be used with operating systems that require a 3-character
extension.

-long_titles <num>
Same as setting: $LONG_TITLES = <num>; Instead of the standard names: node1.html,
node2.html,... the filenames for each HTML page are constructed from the first
<num> words of the section heading for that page, separated by the `_' character.
Commas and common short words (a an to by of and for the) are omitted from both
title and word-count. Warning: Use this switch with great caution. Currently there
are no checks for uniqueness of names or overall length. Very long names can easily
result from using this feature.

-custom_titles
Same as setting: $CUSTOM_TITLES = 1; Instead of the standard names: node1.html,
node2.html, ... the filenames for each HTML page are constructed using a Perl
subroutine named custom_title_hook . The user may define his/her own version of
this subroutine, within a .latex2html-init file say, to override the default (which
uses the standard names). This subroutine takes the section-heading as a parameter
and must return the required name, or the empty string (default).

-dir <output-directory>
Same as setting: $DESTDIR = <output-directory> ; Redirect the output to the
specified directory. The default behaviour is to create (or reuse) a directory
having the same name as the prefix of the document being processed.

-no_subdir
Same as setting: $NO_SUBDIR = 1; Place the generated HTML files into the current
directory. This overrides any $DESTDIR setting.

-prefix <filename-prefix>
Same as setting: $PREFIX = <filename-prefix> ; The <filename-prefix> will be
prepended to all .gif, .pl and .html files produced, except for the top-level .html
file; it may include a (relative) directory path. This will enable multiple
products of LaTeX2HTML to peacefully coexist in the same directory. However, do not
attempt to simultaneously run multiple instances of LaTeX2HTML using the same
output directory, else various temporary files will overwrite each other.

-auto_prefix
Same as setting: $AUTO_PREFIX = 1; Constructs the prefix as `<title>-' to be
prepended to all the files produced, where <title> is the name of the LaTeX file
being processed. (Note the `-' in this prefix.) This overrides any $PREFIX
setting.

-no_auto_link
Same as setting: $NO_AUTO_LINK = 1; If $NO_AUTO_LINK is empty and variables
$LINKPOINT and $LINKNAME are defined appropriately (as is the default in the
latex2html.config file), then a hard link to the main HTML page is produced, using
the name supplied in $LINKNAME. Typically this is index.html; on many systems a
file of this name will be used, if it exists, when a browser tries to view a URL
which points to a directory. On other systems a different value for $LINKNAME may
be appropriate. Typically $LINKPOINT has value $FILE.html, but this may also be
changed to match whichever HTML page is to become the target of the automatic link.
Use of the -no_auto_link switch cancels this automatic linking facility, when not
required for a particular document.

-split <num>
Same as setting: $MAX_SPLIT_DEPTH = <num>; (default is 8) Stop splitting sections
into separate files at this depth. Specifying -split 0 will put the entire document
into a single HTML file. See below for the different levels of sectioning. Also see
the next item for how to set a ``relative'' depth for splitting.

-split +<num>
Same as setting: $MAX_SPLIT_DEPTH = -<num>; (default is 8) The level at which to
stop splitting sections is calculated ``relative to'' the shallowest level of
sectioning that occurs within the document. For example, if the document contains
\section commands, but no \part or \chapter commands, then -split +1 will cause
splitting at each \section but not at any deeper level; whereas -split +2 or -split
+3 also split down to \subsection and \subsubsection commands respectively.
Specifying -split +0 puts the entire document into a single HTML file.

-link <num>
Same as setting: $MAX_LINK_DEPTH = <num>; (default is 4) For each node, create
links to child nodes down to this much deeper than the node's sectioning-level.
Specifying -link 0 will show no links to child nodes from that page, -link 1 will
show only the immediate descendants, etc. A value at least as big as that of the
-split <num> depth will produce a mini table-of-contents (when not empty) on each
page, for the tree structure rooted at that node. When the page has a sectioning-
level less than the -split depth, so that the a mini table-of-contents has links to
other HTML pages, this table is located at the bottom of the page, unless placed
elsewhere using the \tableofchildlinks command. On pages having a sectioning-level
just less than the -split depth the mini table-of-contents contains links to
subsections etc. occurring on the same HTML page. Now the table is located at the
top of this page, unless placed elsewhere using the \tableofchildlinks command.

-toc_depth <num>
Same as setting: $TOC_DEPTH = <num>; (default is 4) Sectioning levels down to <num>
are to be included within the Table-of-Contents tree.

-toc_stars
Same as setting: $TOC_STARS = 1; Sections created using the starred-form of
sectioning commands are included within the Table-of-Contents. As with LaTeX,
normally such sections are not listed.

-show_section_numbers
Same as setting: $SHOW_SECTION_NUMBERS = 1; Show section numbers. By default
section numbers are not shown, so as to encourage the use of particular sections as
stand-alone documents. In order to be shown, section titles must be unique and
must not contain inlined graphics.

-unsegment
Same as setting: $UNSEGMENT = 1; Treat a segmented document (see the section about
document segmentation) like it were not segmented. This will cause the translator
to concatenate all segments and process them as a whole. You might find this useful
to check a segmented document for consistency. For all documents the sectioning
levels referred to above are:
0 document
1 part
2 chapter
3 section
4 subsection
5 subsubsection
6 paragraph
7 subparagraph
8 subsubparagraph

These levels apply even when the document contains no sectioning for the shallower levels;
e.g. no \part or \chapter commands is most common, especially when using LaTeX's article
document-class.

Options controlling Extensions and Special Features

The switches described here govern the type of HTML code that can be generated, and how to
choose between the available options when there are alternative strategies for
implementing portions of LaTeX code.

-html_version (2.0|3.0|3.2)[,(math|i18n|table)]*
Same as setting: $HTML_VERSION = ... ; This specifies both the HTML version to
generate, and any extra (non-standard) HTML features that may be required. The
version number corresponds to a published DTD for an HTML standard (although 3.0
was never accepted and subsequently withdrawn). A corresponding Perl file in the
versions/ subdirectory is loaded; these files are named `html<num>.pl'. Following
the version number, a comma-separated list of extensions can be given. Each
corresponds to a file `<name>.pl' also located in the versions/ subdirectory. When
such a file is loaded the resulting HTML code can no longer be expected to validate
with the specified DTD. An exception is math when the -no_math switch is also used,
which should still validate. Currently, versions 2.0, 3.2 and 4.0 are available.
(and also 2.1, 2.2, 3.0 and 3.1, for historical reasons). The extensions i18n,
tables, math correspond roughly to what used to be called versions `2.1', `2.2',
`3.1' respectively, in releases of LaTeX2HTML up to 1996. Now these extensions can
be loaded with any of `2.0', `3.2' or `4.0' as the specified standard. The default
version is usually set to be `3.2', within latex2html.config.

-no_tex_defs
Same as setting: $TEXDEFS = 0; (default is 1) When $TEXDEFS is set (default) the
file texdefs.perl will be read. This provides code to allow common TEX commands
like \def, \newbox, \newdimen and others, to be recognised, especially within the
document preamble. In the case of \def, the definition may even be fully
interpreted, but this requires the pattern-matching to be not too complicated. If
$TEXDEFS is `0' or empty, then texdefs.perl will not be loaded; the translator will
make no attempt to interpret any raw TEX commands. This feature is intended to
enable sophisticated authors the ability to insert arbitrary TEX commands in
environments that are destined to be processed by LaTeX anyway; e.g. figures,
theorems, pictures, etc. However this should rarely be needed, as now there is
better support for these types of environment. There are now other methods to
specify which chunks of code are to be passed to LaTeX for explicit image-
generation; see the discussion of the makeimage environment.

-external_file <filename>
Same as setting: $EXTERNAL_FILE = <filename> ; Specifies the prefix of the .aux
file that this document should read. The .aux extension will be appended to this
prefix to get the complete filename, with directory path if needed. This file
could contain necessary information regarding citations, figure, table and section
numbers from LaTeX and perhaps other information also. Use of this switch is vital
for document segments, processed separately and linked to appear as if generated
from a single LaTeX document.

-font_size <size>
Same as setting: $FONT_SIZE = <size> ; This option provides better control over the
font size of environments made into images using LaTeX. <size> must be one of the
font sizes that LaTeX recognizes; i.e. `10pt', `11pt', `12pt', etc. Default is
`10pt', or whatever option may have been specified on the \documentclass or
\documentstyle line. Whatever size is selected, it will be magnified by the
installation variables $MATH_SCALE_FACTOR, $FIGURE_SCALE_FACTOR and
$DISP_SCALE_FACTOR as appropriate. Note: This switch provides no control over the
size of text on the HTML pages. Such control is subject entirely to the user's
choices of settings for the browser windows.

-scalable_fonts
Same as setting: $SCALABLE_FONTS = 1; This is used when scalable fonts, such as
PostScript versions of the TEX fonts, are available for image-generation. It has
the effect of setting $PK_GENERATION to `1', and $DVIPS_MODE to be empty,
overriding any previous settings for these variables.

-no_math
Same as setting: $NO_SIMPLE_MATH = 1; Ordinarily simple mathematical expressions
are set using the ordinary text font, but italicized. When part of the expression
can not be represented this way, an image is made of the whole formula. This is
called ``simple math''. When $NO_SIMPLE_MATH is set, then all mathematics is made
into images, whether simple or not. However, if the math extension is loaded,
using the -html_version switch described earlier, then specifying -no_math produces
a quite different effect. Now it is the special <MATH> tags and entities which are
canceled. In their place a sophisticated scheme for parsing mathematical
expressions is used. Images are made of those sub-parts of a formula which cannot
be adequately expressed using (italicized) text characters and <SUB> and <SUP>
tags. See the subsection on mathematics for more details.

-local_icons
Same as setting: $LOCAL_ICONS = 1; A copy of each of the icons actually used within
the document is placed in the directory along with the HTML files and generated
images. This allows the whole document to be fully self-contained, within this
directory; otherwise the icons must be retrieved from a (perhaps remote) server.
The icons are normally copied from a subdirectory of the

$LATEX2HTMLDIR,
set within latex2html.config. An alternative set of icons can be used by
specifying a (relative) directory path in $ALTERNATIVE_ICONS to where the
customised images can be found.

-init_file <file>
Load the specified initialisation file. This Perl file will be loaded after loading
$HOME/.latex2html-init, or .latex2html-init in the local directory, if either file
exists. It is read at the time the switch is processed, so the contents of the file
may change any of the values of any of the variables that were previously
established, as well as any default options. More than one initialisation file can
be read in this way. [change_begin]98.1

-no_fork
Same as setting: $NOFORK = 1; When set this disables a feature in the early part of
the processing whereby some memory-intensive operations are performed by `forked'
child processes. Some single-task operating systems, such as DOS, do not support
this feature. Having $NOFORK set then ensures that unnecessary file-handles that
are needed with the forked processes, are not consumed unnecessarily, perhaps
resulting in a fatal Perl error.

-iso_language <type>
This enables you to specify a different language type than 'EN' to be used in the
DTD entries of the HTML document, e.g. 'EN.US'. [change_end] 98.1

-short_index
Same as setting: $SHORT_INDEX = 1; Creates shorter Index listings, using codified
links; this is fully compatible with the makeidx package.

-no_footnode
Same as setting: $NO_FOOTNODE = 1; Suppresses use of a separate file for footnotes;
instead these are placed at the bottom of the HTML pages where the references
occur. When this option is used, it is frequently desirable to change the style of
the marker used to indicate the presence of a footnote. This is done as in LaTeX,
using code such as follows. \renewcommand{\thefootnote}{\arabic{footnote}} All the
styles \arabic, \alph, \roman, \Alph and \Roman are available. [change_begin]98.1

-numbered_footnotes
Same as setting: $NUMBERED_FOOTNOTES = 1; If this is set you will get every
footnote applied with a subsequent number, to ease readability. [change_end] 98.1

-address <author-address>
Same as setting: $ADDRESS = <author-address> ; Sign each page with this address.
See latex2html.config for an example using Perl code to automatically include the
date. A user-defined Perl subroutine called &custom_address can be used instead,
if defined; it takes the value of $ADDRESS as a parameter, which may be used or
ignored as desired. At the time when this subroutine will be called, variables
named $depth, $title, $file hold the sectioning-level, title and filename of the
HTML page being produced; $FILE holds the name of the filename for the title-page
of the whole document.

-info <string>
Same as setting: $INFO = <string> ; Generate a new section ``About this document''
containing information about the document being translated. The default is to
generate such a section with information on the original document, the date, the
user and the translator. An empty string (or the value `0') disables the creation
of this extra section. If a non-empty string is given, it will be placed as the
contents of the ``About this document'' page instead of the default information.

Switches controlling Image Generation

These switches affect whether images are created at all, whether old images are reused on
subsequent runs or new ones created afresh, and whether anti-aliasing effects are used
within the images themselves.

-ascii_mode
Same as setting: $ASCII_MODE = $EXTERNAL_IMAGES = 1; Use only ASCII characters and
do not include any images in the final output. With -ascii_mode the output of the
translator can be used on character-based browsers, such as lynx, which do not
support inlined images (via the <IMG> tag).

-nolatex
Same as setting: $NOLATEX = 1; Disable the mechanism for passing unknown
environments to LaTeX for processing. This can be thought of as ``draft mode''
which allows faster translation of the basic document structure and text, without
fancy figures, equations or tables. (This option has been superseded by the
-no_images option, see below.)

-external_images
Same as setting: $EXTERNAL_IMAGES = 1; Instead of including any generated images
inside the document, leave them outside the document and provide hypertext links to
them.

-ps_images
Same as setting: $PS_IMAGES = $EXTERNAL_IMAGES = 1; Use links to external
PostScript files rather than inlined images in the chosen graphics format.

-discard
Same as setting: $DISCARD_PS = 1; The temporary PostScript files are discarded
immediately after they have been used to create the image in the desired graphics
format.

-no_images
Same as setting: $NO_IMAGES = 1; Do not attempt to produce any inlined images. The
missing images can be generated ``off-line'' by restarting LaTeX2HTML with the
option -images_only .

-images_only
Same as setting: $IMAGES_ONLY = 1; Try to convert any inlined images that were left
over from previous runs of LaTeX2HTML.

-reuse <reuse_option>
Same as setting: $REUSE = <reuse_option>; This switch specifies the extent to which
image files are to be shared or recycled. There are three valid options: [*] 0 Do
not ever share or recycle image files. This choice also invokes an interactive
session prompting the user about what to do about a pre-existing HTML directory, if
it exists. [*] 1 Recycle image files from a previous run if they are available,
but do not share identical images that must be created in this run. [*] 2 Recycle
image files from a previous run and share identical images from this run. This is
the default. A later section provides additional information about image-reuse.

-no_reuse
Same as setting: $REUSE = 0; Do not share or recycle images generated during
previous translations. This is equivalent to -reuse 0 . (This will enable the
initial interactive session during which the user is asked whether to reuse the old
directory, delete its contents or quit.)

-antialias
Same as setting: $ANTI_ALIAS = 1; (Default is 0.) Generated images of figure
environments and external PostScript files should use anti-aliasing. By default
anti-aliasing is not used with these images, since this may interfere with the
contents of the images themselves.

-antialias_text
Same as setting: $ANTI_ALIAS_TEXT = 1; (Default is 1.) Generated images of typeset
material such as text, mathematical formulas, tables and the content of makeimage
environments, should use anti-aliasing effects. The default is normally to use
anti-aliasing for text, since the resulting images are much clearer on-screen.
However the default may have been changed locally.

-no_antialias
Same as setting: $ANTI_ALIAS = 0; (Default is 0.) Generated images of figure
environments and external PostScript files should not use anti-aliasing with
images, though the local default may have been changed to use it.

-no_antialias_text
Same as setting: $ANTI_ALIAS_TEXT = 0; (Default is 1.) Generated images of typeset
material should not use anti-aliasing effects. Although on-screen images of text
are definitely improved using anti-aliasing, printed images can be badly blurred,
even at 300dpi. Higher resolution printers do a much better job with the resulting
grey-scale images. [change_begin]98.1

-white Same as setting: $WHITE_BACKGROUND = 1; (Default is 1.) Ensures that images of
figure environments have a white background. Otherwise transparency effects may
not work correctly.

-no_white
Same as setting: $WHITE_BACKGROUND = ''; (Default is 1.) Cancels the requirement
that figure environments have a white background.

-ldump Same as setting: $LATEX_DUMP = 1; (Default is 0.) Use this if you want to speed up
image processing during the 2nd and subsequent runs of LaTeX2HTML on the same
document. The translator now produces a LaTeX format-dump of the preamble to
images.tex which is used on subsequent runs. This significantly reduces the startup
time when LaTeX reads the images.tex file for image-generation. This process
actually consumes additional time on the first run, since LaTeX is called twice --
once to create the format-dump, then again to load and use it. The pay-off comes
with the faster loading on subsequent runs. Approximately 1 Meg of disk space is
consumed by the dump file. [change_end] 98.1

Switches controlling Navigation Panels

       The following switches govern whether to include one or more  navigation  panels  on  each
       HTML page, also which buttons to include within such a panel.

       -no_navigation
              Same  as  setting: $NO_NAVIGATION = 1; Disable the mechanism for putting navigation
              links  in  each  page.   This  overrides  any  settings  of  the   $TOP_NAVIGATION,
              $BOTTOM_NAVIGATION and $AUTO_NAVIGATION variables.

       -top_navigation
              Same as setting: $TOP_NAVIGATION = 1; Put navigation links at the top of each page.

       -bottom_navigation
              Same as setting: $BOTTOM_NAVIGATION = 1; Put navigation links at the bottom of each
              page as well as the top.

       -auto_navigation
              Same as setting: $AUTO_NAVIGATION = 1; Put navigation links  at  the  top  of  each
              page.  Also  put  one at the bottom of the page, if the page exceeds $WORDS_IN_PAGE
              number of words (default = 450).

       -next_page_in_navigation
              Same as setting: $NEXT_PAGE_IN_NAVIGATION = 1; Put a link to the next logical  page
              in the navigation panel.

       -previous_page_in_navigation
              Same  as  setting:  $PREVIOUS_PAGE_IN_NAVIGATION  =  1;  Put a link to the previous
              logical page in the navigation panel.

       -contents_in_navigation
              Same as setting: $CONTENTS_IN_NAVIGATION = 1; Put a link to  the  table-of-contents
              in the navigation panel if there is one.

       -index_in_navigation
              Same  as  setting:  $INDEX_IN_NAVIGATION  =  1; Put a link to the index-page in the
              navigation panel if there is an index.

Switches for Linking to other documents

       When processing a single stand-alone document, the  switches  described  in  this  section
       should  not  be  needed  at  all,  since  the  automatically  generated navigation panels,
       described on the previous page should generate all the required navigation links.  However
       if  a  document  is  to be regarded as part of a much larger document, then links from its
       first and final pages, to locations in other parts of the larger (virtual) document,  need
       to  be provided explicitly for some of the buttons in the navigation panel.  The following
       switches allow for such links to other documents, by  providing  the  title  and  URL  for
       navigation   panel  hyperlinks.  In  particular,  the  ``Document  Segmentation''  feature
       necessarily makes great use of these switches. It is usual for the  text  and  targets  of
       these  navigation hyperlinks to be recorded in a Makefile, to avoid tedious typing of long
       command-lines having many switches.

       -up_url <URL>
              Same as setting: $EXTERNAL_UP_LINK = <URL> ; Specifies a universal resource locator
              (URL) to associate with the ``UP'' button in the navigation panel(s).

       -up_title <string>
              Same  as setting: $EXTERNAL_UP_TITLE = <string> ; Specifies a title associated with
              this URL.

       -prev_url <URL>
              Same as setting: $EXTERNAL_PREV_LINK = <URL> ; Specifies a URL  to  associate  with
              the ``PREVIOUS'' button in the navigation panel(s).

       -prev_title <string>
              Same  as  setting:  $EXTERNAL_PREV_TITLE  = <string> ; Specifies a title associated
              with this URL.

       -down_url <URL>
              Same as setting: $EXTERNAL_DOWN_LINK = <URL> ; Specifies a  URL  for  the  ``NEXT''
              button in the navigation panel(s).

       -down_title <string>
              Same  as  setting:  $EXTERNAL_DOWN_TITLE  = <string> ; Specifies a title associated
              with this URL.

       -contents <URL>
              Same as setting: $EXTERNAL_CONTENTS = <URL> ; Specifies a URL for the  ``CONTENTS''
              button, for document segments that would not otherwise have one.

       -index <URL>
              Same  as  setting:  $EXTERNAL_INDEX  =  <URL>  ;  Specifies a URL for the ``INDEX''
              button, for document segments that otherwise would not have an index.

       -biblio <URL>
              Same as setting: $EXTERNAL_BIBLIO = <URL> ; Specifies the URL for the  bibliography
              page to be used, when not explicitly part of the document itself.  Warning: On some
              systems it is difficult to give text-strings <string> containing space  characters,
              on  the  command-line  or  via  a  Makefile. One way to overcome this is to use the
              corresponding variable. Another way is to replace the spaces with underscores (_).

Switches for Help and Tracing

The first two of the following switches are self-explanatory. When problems arise in
processing a document, the switches -debug and -verbosity will each cause LaTeX2HTML to
generate more output to the screen. These extra messages should help to locate the cause
of the problem.

-tmp <path>
Define a temporary directory to use for image generation. If <path> is 0, the
standard temporary directory /tmp is used.

-h(elp)
Print out the list of all command-line options.

-v Print the current version of LaTeX2HTML.

-debug Same as setting: $DEBUG = 1; Run in debug-mode, displaying messages and/or
diagnostic information about files read, and utilities called by LaTeX2HTML. Shows
any messages produced by these calls. More extensive diagnostics, from the Perl
debugger, can be obtained by appending the string `-w-' to the 1st line of the
latex2html (and other) Perl script(s).

-verbosity <num>
Same as setting: $VERBOSITY = <num>; Display messages revealing certain aspects of
the processing performed by LaTeX2HTML on the provided input file(s). The <num>
parameter can be an integer in the range 0 to 8. Each higher value adds to the
messages produced.

0. No special tracing; as for versions of LaTeX2HTML prior to V97.1.

1. (This is the default.) Show section-headings and the corresponding HTML file names,
and indicators that major stages in the processing have been completed.

2. Print environment names and identifier numbers, and new theorem-types. Show
warnings as they occur, and indicators for more stages of processing. Print names
of files for storing auxiliary data arrays.

3. Print command names as they are encountered and processed; also any unknown
commands encountered while pre-processing. Show names of new commands,
environments, theorems, counters and counter-dependencies, for each document
partition.

4. Indicate command-substitution the pre-process of math-environments. Print the
contents of unknown environments for processing in LaTeX, both before and after
reverting to LaTeX source. Show all operations affecting the values of counters.
Also show links, labels and sectioning keys, at the stages of processing.

5. Detail the processing in the document preamble. Show substitutions of new
environments. Show the contents of all recognised environments, both before and
after processing. Show the cached/encoded information for the image keys, allowing
two images to be tested for equality.

6. Show replacements of new commands, accents and wrapped commands.

7. Trace the processing of commands in math mode; both before and after.

8. Trace the processing of all commands, both before and after. The command-line
option sets an initial value only. During processing the value of $VERBOSITY can be
set dynamically using the \htmltracing{...} command, whose argument is the desired
value, or by using the more general \HTMLset command as follows:
\HTMLset{VERBOSITY}{<num>}.

Other Configuration Variables, without switches

The configuration variables described here do not warrant having a command-line switch to
assign values. Either they represent aspects of LaTeX2HTML that are specific to the local
site, or they govern properties that should apply to all documents, rather than something
that typically would change for the different documents within a particular sub-directory.
Normally these variables have their value set within the latex2html.config file. In the
following listing the defaults are shown, as the lines of Perl code used to establish
these values. If a different value is required, then these can be assigned from a local
.latex2html-init initialisation file, without affecting the defaults for other users, or
documents processed from other directories.

$dd holds the string to be used in file-names to delimit directories; it is set
internally to `/', unless the variable has already been given a value within
latex2html.config . Note: This value cannot be set within a .latex2html-init
initialisation file, since its value needs to be known in order to find such a
file.

$LATEX2HTMLDIR
Read by the install-test script from latex2html.config, its value is inserted into
the latex2html Perl script as part of the installation process.

$LATEX2HTMLSTYLES = $LATEX2HTMLDIR/styles ;
Read from the latex2html.config file by install-test, its value is checked to
locate the styles/ directory.

$LATEX2HTMLVERSIONS = $LATEX2HTMLDIR/versions ;
The value of this variable should be set within latex2html.config to specify the
directory path where the version and extension files can be found.

$ALTERNATIVE_ICONS = '';
This may contain the (relative) directory path to a set of customised icons to be
used in conjunction with the -local_icons switch.

$TEXEXPAND = $LATEX2HTMLDIR/texexpand ;
Read by the install-test Perl script from latex2html.config, its value is used to
locate the texexpand Perl script.

$PSTOIMG = $LATEX2HTMLDIR/pstoimg ;
Read by the install-test Perl script from latex2html.config, its value is used to
locate the pstoimg Perl script.

$IMAGE_TYPE = '<image-type>';
Set in latex2html.config, the currently supported <image-type>s are: gif and png.

$DVIPS = 'dvips';
Read from latex2html.config by install-test, its value is checked to locate the
dvips program or script. There could be several reasons to change the value here:

add a switch -P<printer> to load a specific configuration-file; e.g. to use
a specific set of PostScript fonts, for improved image-generation.

to prepend a path to a different version of dvips than normally available as
the system default (e.g. the printing requirements are different).

to append debugging switches, in case of poor quality images; one can see
which paths are being searched for fonts and other resources.

to prepend commands for setting path variables that dvips may need in order
to locate fonts or other resources.

If automatic generation of fonts is required, using Metafont, the following
configuration variables are important.

$PK_GENERATION = 1;
This variable must be set, to initiate font-generation; otherwise fonts will
be scaled from existing resources on the local system. In particular this
variable must not be set, if one wishes to use PostScript fonts or other
scalable font resources (see the -scalable_fonts switch).

$DVIPS_MODE = 'toshiba';
The mode given here must be available in the modes.mf file, located with the
Metafont resource files, perhaps in the misc/ subdirectory.

$METAFONT_DPI = 180;
The required resolution, in dots-per-inch, should be listed specifically
within the MakeTeXPK script, called by dvips to invoke Metafont with the
correct parameters for the required fonts.

$LATEX = 'latex';
Read from latex2html.config by install-test, its value is checked to locate the
latex program or script. If LaTeX is having trouble finding style-files and/or
packages, then the default command can be prepended with other commands to set
environment variables intended to resolve these difficulties; e.g. $LATEX =
'setenv TEXINPUTS <path to search> ; latex' . There are several variables to help
control exactly which files are read by LaTeX2HTML and by LaTeX when processing
images:

$TEXINPUTS
This is normally set from the environment variable of the same name. If
difficulties occur so that styles and packages are not being found, then
extra paths can be specified here, to resolve these difficulties.

$DONT_INCLUDE
This provides a list of filenames and extensions to not include, even if
requested to do so by an \input or \include command. (Consult
latex2html.config for the default list.)

$DO_INCLUDE = '';
List of exceptions within the $DONT_INCLUDE list. These files are to be read
if requested by an \input or \include command.

$ICONSERVER = '<URL>';
This is used to specify a URL to find the standard icons, as used for the
navigation buttons. Names for the specific images size, as well as size
information, can be found in latex2html.config. The icons themselves can be
replaced by customised versions, provided this information is correctly updated and
the location of the customised images specified as the value of $ICONSERVER. When
the -local_icons switch is used, so that a copy of the icons is placed with the
HTML files and other generated images, the value of $ICONSERVER is not needed
within the HTML files themselves. However it is needed to find the original icons
to be copied to the local directory.

$NAV_BORDER = <num>;
The value given here results in a border, measured in points, around each icon. A
value of `0' is common, to maintain strict alignment of inactive and active buttons
in the control panels.

$LINKNAME = '"index.$EXTN"';
This is used when the $NO_AUTO_LINK variable is empty, to allow a URL to the
working directory to be sufficient to reach the main page of the completed
document. It specifies the name of the HTML file which will be automatically linked
to the directory name. The value of $EXTN is .html unless $SHORTEXTN is set, in
which case it is .htm .

$LINKPOINT = '"$FILE$EXTN"';
This specifies the name of the HTML file to be duplicated, or symbolically linked,
with the name specified in $LINKNAME. At the appropriate time the value of $FILE
is the document name, which usually coincides with the name of the working
directory.

$CHARSET = 'iso_8859_1';
This specifies the character set used within the HTML pages produced by LaTeX2HTML.
If no value is set in a configuration or initialisation file, the default value
will be assumed. The lowercase form $charset is also recognised, but this is
overridden by the uppercase form.

$ACCENT_IMAGES = 'large';
Accented characters that are not part of the ISO-Latin fonts can be generated by
making an image using LaTeX. This variable contains a (comma-separated) list of
LaTeX commands for setting the style to be used when these images are made. If the
value of this variable is empty then the accent is simply ignored, using an un-
accented font character (not an image) instead.

Within the color.perl package, the following two variables are used to identify the names
of files containing specifications for named colors. Files having these names are
provided, in the $LATEX2HTMLSTYLES directory, but they could be moved elsewhere, or
replaced by alternative files having different names. In such a case the values of these
variables should be altered accordingly.

$RGBCOLORFILE = 'rgb.txt';

$CRAYOLAFILE = 'crayola.txt';

The following variables may well be altered from the system defaults, but this is best
done using a local .latex2html-init initialisation file, for overall consistency of style
within documents located at the same site, or sites in close proximity.

$default_language = 'english';
This establishes which language code is to be placed within the <!DOCTYPE ... > tag
that may appear at the beginning of the HTML pages produced. Loading a package for
an alternative language can be expected to change the value of this variable. See
also the $TITLES_LANGUAGE variable, described next.

$TITLES_LANGUAGE = 'english';
This variable is used to specify the actual strings used for standard document
sections, such as ``Contents'', ``References'', ``Table of Contents'', etc.
Support for French and German titles is available in corresponding packages.
Loading such a package will normally alter the value of this variable, as well as
the $default_language variable described above.

$WORDS_IN_NAVIGATION_PANEL_TITLES = 4;
Specifies how many words to use from section titles, within the textual hyperlinks
which accompany the navigation buttons.

$WORDS_IN_PAGE = 450;
Specifies the minimum page length required before a navigation panel is placed at
the bottom of a page, when the $AUTO_NAVIGATION variable is set.

$CHILDLINE = "<BR><HR>\n";
This gives the HTML code to be placed between the child-links table and the
ordinary contents of the page on which it occurs.

$NETSCAPE_HTML = 0;
When set, this variable specifies that HTML code may be present which does not
conform to any official standard. This restricts the contents of any <!DOCTYPE ...
> tag which may be placed at the beginning of the HTML pages produced.

$BODYTEXT = '';
The value of this variable is used within the <BODY ... > tag; e.g. to set text
and/or background colors. It's value is overridden by the \bodytext command, and
can be added-to or parts changed using the \htmlbody command or \color and
\pagecolor from the color package.

$INTERLACE = 1;
When set, interlaced images should be produced. This requires graphics utilities
to be available to perform the interlacing operation.

$TRANSPARENT_FIGURES = 1;
When set, the background of images should be made transparent; otherwise it is
white. This requires graphics utilities to be available which can specify the
color to be made transparent.

$FIGURE_SCALE_FACTOR = 1.6;
Scale factor applied to all images of figure and other environments, when being
made into an image. Note that this does not apply to recognised mathematics
environments, which instead use the contents of $MATH_SCALE_FACTOR and
$DISP_SCALE_FACTOR to specify scaling.

$MATH_SCALE_FACTOR = 1.6;
Scale factor applied to all images of mathematics, both inline and displayed. A
value of 1.4 is a good alternative, with anti-aliased images.

$DISP_SCALE_FACTOR = 1;
Extra scale factor applied to images of displayed math environments. When set,
this value multiplies $MATH_SCALE_FACTOR to give the total scaling. A value of
`1.2' is a good choice to accompany $MATH_SCALE_FACTOR = 1.4;.

$EXTRA_IMAGE_SCALE
This may hold an extra scale factor that can be applied to all generated images.
When set, it specifies that a scaling of $EXTRA_IMAGE_SCALE be applied when images
are created, but to have their height and width recorded as the un-scaled size.
This is to coax browsers into scaling the (usually larger) images to fit the
desired size; when printed a better quality can be obtained. Values of `1.5' and
`2' give good print quality at 600dpi.

$PAPERSIZE = 'a5';
Specifies the size of a page for typesetting figures or displayed math, when an
image is to be generated. This affects the lengths of lines of text within images.
Since images of text or mathematics should use larger sizes than when printed, else
clarity is lost at screen resolutions, then a smaller paper-size is generally
advisable. This is especially so if both the $MATH_SCALE_FACTOR and
$DISP_SCALE_FACTOR scaling factors are being used, else some images may become
excessively large, including a lot of blank space.

$LINE_WIDTH = 500;
Formerly specified the width of an image, when the contents were to be right- or
center-justified. (No longer used.)

The following variables are used to access the utilities required during image-generation.
File and program locations on the local system are established by the configure-pstoimg
Perl script and stored within $LATEX2HTMLDIR/local.pm as Perl code, to be read by pstoimg
when required. After running the configure-pstoimg Perl script it should not be necessary
to alter the values obtained. Those shown below are what happens on the author's system;
they are for illustration only and do not represent default values.

$GS_LIB = '/usr/local/share/ghostscript/4.02';
$PNMCAT = '/usr/local/bin/pnmcat';
$PPMQUANT = '/usr/local/bin/ppmquant';
$PNMFLIP = '/usr/local/bin/pnmflip';
$PPMTOGIF = '/usr/local/bin/ppmtogif';
$HOWTO_TRANSPARENT_GIF = 'netpbm';
$GS_DEVICE = 'pnmraw';
$GS = '/usr/local/bin/gs';
$PNMFILE = '/usr/local/bin/pnmfile';
$HOWTO_INTERLACE_GIF = 'netpbm';
$PBMMAKE = '/usr/local/bin/pbmmake';
$PNMCROP = '/usr/local/bin/pnmcrop';
$TMP = '/usr/var/tmp'; The following variables are no longer needed, having been replaced
by the more specific information obtained using the Perl script configure-pstoimg.
$USENETPBM = 1;
$PBMPLUSDIR = '/usr/local/bin';

AUTHOR

       Nikos Drakos,  Computer Based Learning Unit, University of Leeds  <nikos@cbl.leeds.ac.uk>.
       Several  people have contributed suggestions, ideas, solutions, support and encouragement.
       The current maintainer is Ross Moore.  This manual page was written  by  Manoj  Srivastava
       <srivasta@debian.org>,  for  the Debian GNU/Linux system, based on the LaTeX documentation
       accompanying the program.