grohtml(1) — Linux manual page

Name | Synopsis | Description | Options | Usage | Dependencies | Files | Environment | Bugs | See also | COLOPHON

grohtml(1)               General Commands Manual              grohtml(1)

Name         top

       grohtml, post-grohtml, pre-grohtml - groff output driver for HTML

Synopsis         top

       pre-grohtml [-epV] [-a anti-aliasing-text-bits] [-D image-
                   directory] [-F font-directory] [-g anti-aliasing-
                   graphic-bits] [-i resolution] [-I image-stem] [-o
                   image-vertical-offset] [-x html-dialect] [file ...]

       pre-grohtml --help

       pre-grohtml -v
       pre-grohtml --version

       post-grohtml [-bCGhlnrVy] [-F font-directory] [-j output-stem]
                    [-s base-point-size] [-S heading-level] [-x html-
                    dialect] [file ...]

       post-grohtml --help

       post-grohtml -v
       post-grohtml --version

Description         top

       The GNU roff system's HTML support consists of a preprocessor,
       pre-grohtml, and a device driver, post-grohtml; together, they
       translate roff(7) documents to HTML.  Users should always invoke
       grohtml via the groff(1) command with the -Thtml option.  If no
       operands are given, or if file is “-”, grohtml reads the standard
       input stream.  Output is written to the standard output stream.
       When grohtml is run by groff, options can be passed to grohtml
       using groff's -P option.

       grohtml invokes groff twice.  In the first pass, the preprocessor
       pre-grohtml renders pictures, equations, and tables as images in
       PostScript format using the ps output driver.  In the second
       pass, the output driver post-grohtml translates the output of
       troff(1) to HTML.

       grohtml always writes output encoded in UTF-8 and has built-in
       entities for all non-composite Unicode characters.  In spite of
       this, groff may issue warnings about unknown special characters
       if they can't be found during the first pass.  Such warnings can
       be safely ignored unless the special characters appear inside a
       table or equation.

Options         top

       --help displays a usage message, while -v and --version show
       version information; all exit afterward.

       -a anti-aliasing-text-bits
              Number of bits of antialiasing information to be used by
              text when generating PNG images.  The default is 4 but
              valid values are 0, 1, 2, and 4.  Note that your version
              of gs needs to support the -dTextAlphaBits and
              -dGraphicAlphaBits options in order to exploit
              antialiasing.  A value of 0 stops grohtml from issuing
              antialiasing commands to gs.

       -b     Initialize the background color to white.

       -C     Suppress output of “CreationDate:” HTML comment.

       -D image-directory
              Instruct grohtml to place all image files into directory

       -e     This option should not be directly specified; it is an
              internal option used by groff when -Thtml or -Txhtml is
              specified.  grohtml's preprocessor uses it to determine
              whether eqn should be directed to produce MathML (if
              -Txhtml is specified).

       -F font-directory
              Prepend directory font-directory/devname to the search
              path for font and device description files; name is the
              name of the device, usually html.

       -G     Suppress output of “Creator:” HTML comment.

       -g anti-aliasing-graphic-bits
              Number of bits of antialiasing information to be used by
              graphics when generating PNG images.  The default is 4 but
              valid values are 0, 1, 2, and 4.  Note your version of gs
              needs to support the -dTextAlphaBits and
              -dGraphicAlphaBits options in order to exploit
              antialiasing.  A value of 0 stops grohtml from issuing
              antialiasing commands to gs.

       -h     Generate section and number headings by using <B>...</B>
              and increasing the font size, rather than using the
              <Hn>...</Hn> tags.

       -i resolution
              Select the resolution for all images.  By default this is
              100 pixels per inch.  Example: -i200 indicates 200 pixels
              per inch.

       -I image-stem
              Determine the image file name stem.  If omitted, grohtml
              uses grohtml-XXXXX (where XXXXX is the process ID).  A
              dash is appended to the stem to separate it from the
              following image number.

       -j output-stem
              Instruct grohtml to split the HTML output into multiple
              files.  Output is written to a new file at each section
              heading (but see option -S below) named output-

       -l     Turn off the production of automatic section links at the
              top of the document.

       -n     Generate simple heading anchors whenever a section/number
              heading is found.  Without the option the anchor value is
              the textual heading.  This can cause problems when a
              heading contains a “?” on older versions of some browsers.
              This flag is automatically turned on if a heading contains
              an image.

       -o image-vertical-offset
              Specify the vertical offset of images in points.

       -p     Display page rendering progress to the standard error
              stream.  grohtml only displays a page number when an image
              is required.

       -r     Turn off the automatic header and footer line (HTML rule).

       -s base-point-size
              Set the base point size of the source file.  Thereafter
              when this point size is used in the source it will
              correspond to the HTML base size.  Every increase of two
              points in the source will yield a <big> tag, and
              conversely when a decrease of two points is seen a <small>
              tag is emitted.

       -S heading-level
              When splitting HTML output (see option -j above), split at
              each nested heading level defined by heading-level, or
              higher).  The default is 1.

       -V     Create an XHTML or HTML validator button at the bottom of
              each page of the document.

       -x html-dialect
              Select HTML dialect.  Currently, html-dialect should be
              either the digit 4 or the letter x, which indicates
              whether grohtml should generate HTML 4 or XHTML,
              respectively.  This option should not be directly invoked
              by the user as it is an internal option utilized by groff
              when -Thtml or -Txhtml is specified.

       -y     Produce a right-justified groff signature at the end of
              the document.  This is only generated if the -V flag is
              also specified.

Usage         top

       Font styles called R, I, B, and BI are mounted at font
       positions 1 to 4, respectively.

Dependencies         top

       grohtml is dependent upon the PNG utilities (pnmcut, pnmcrop,
       pnmtopng) and GhostScript (gs).  pnmtopng (version 2.37.6 or
       greater) and pnmcut from the netpbm package (version 9.16 or
       greater) will work also.  It is also dependent upon psselect from
       the PSUtils package.  Images are generated whenever a table,
       picture, equation or line (such as a baseline rule or box rule)
       is encountered.

Files         top

       grohtml uses temporary files.  See groff(1) for details about
       where such files are created.

Environment         top

              A list of directories in which to seek the selected output
              device's directory of device and font description files.
              See troff(1) and groff_font(5).

              A timestamp (expressed as seconds since the Unix epoch) to
              use as the creation timestamp in place of the current
              time.  The time is converted to human-readable form using
              ctime(3) and recorded in an HTML comment.

       TZ     The time zone to use when converting the current time (or
              value of SOURCE_DATE_EPOCH) to human-readable form; see

Bugs         top

       grohtml is still beta code.

       grohtml does not truly support hyphenation, but you can fool it
       into hyphenating long input lines, which can appear in HTML
       output with a hyphenated word followed by a space but no line

See also         top

       groff(1), troff(1), groff_font(5)

COLOPHON         top

       This page is part of the groff (GNU troff) project.  Information
       about the project can be found at 
       ⟨⟩.  If you have a bug report
       for this manual page, see ⟨⟩.
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2021-08-27.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2021-08-23.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

groff 1.23.0.rc1.654-4e1db-dir1t9yAugust 2021                   grohtml(1)