Provided by: groff_1.21-7_i386 bug

NAME

       groffer - display groff files and man pages on X and tty

SYNOPSIS

       groffer [option ...]  [--] [filespec ...]

       groffer -h|--help

       groffer -v|--version

DESCRIPTION

       The groffer program is the easiest way to use groff(1).  It can display
       arbitrary documents written in the groff  language,  see  groff(7),  or
       other  roff languages, see roff(7), that are compatible to the original
       troff language.  It finds and runs all necessary  groff  preprocessors,
       such as chem.

       The  groffer program also includes many of the features for finding and
       displaying the Unix manual pages (man pages), such that it can be  used
       as a replacement for a man(1) program.  Moreover, compressed files that
       can be handled by gzip(1) or bzip2(1) are decompressed on-the-fly.

       The normal usage is quite simple by supplying a file name or name of  a
       man  page  without  further  options.  But the option handling has many
       possibilities for creating special behaviors.  This can be done  either
       in   configuration   files,   with   the   shell  environment  variable
       $GROFFER_OPT, or on the command line.

       The output can be  generated  and  viewed  in  several  different  ways
       available  for  groff.   This includes the groff native X Window viewer
       gxditview(1), each Postcript,  pdf,  or  dvi  display  program,  a  web
       browser  by  generating html in www mode, or several text modes in text
       terminals.

       Most of the options that must be named when running groff directly  are
       determined  automatically for groffer, due to the internal usage of the
       grog(1) program.  But all parts can  also  be  controlled  manually  by
       arguments.

       Several  file  names  can  be  specified on the command line arguments.
       They are transformed into a single document in the normal way of groff.

       Option handling is done in GNU style.  Options and file  names  can  be
       mixed  freely.   The  option  `--'  closes  the  option  handling,  all
       following arguments are treated as file names.   Long  options  can  be
       abbreviated in several ways.

OPTION OVERVIEW

       breaking options

               [-h~| --help] [-v~| --version]

       groffer mode options

               [--auto] [--default] [--default-modes mode1,mode2,...]  [--dvi]
               [--dvi-viewer prog] [--groff] [--html] [--html-viewer prog]
               [--mode display_mode] [--pdf] [--pdf-viewer prog] [--ps]
               [--ps-viewer prog] [--source] [--text] [--to-stdout] [--tty]
               [--tty-viewer prog] [--www] [--www-viewer prog] [--x --X]
               [--x-viewer --X-viewer]

       options related to groff

              [-T~| --device device] [-Z~| --intermediate-output~| --ditroff]

              All further groff short options are accepted.

       options for man pages

        [--apropos] [--apropos-data] [--apropos-devel] [--apropos-progs]
        [--man] [--no-man] [--no-special] [--whatis]

       long options taken over from GNU man

         [--all] [--ascii] [--ditroff] [--extension suffix]
         [--locale language] [--local-file] [--location~| --where]
         [--manpath dir1:dir2:...]  [--no-location] [--pager program]
         [--sections sec1:sec2:...]  [--systems sys1,sys2,...]  [--troff-
         device device]

        Further long options of GNU man are accepted as well.

       X Window Toolkit options

         [--bd~| --bordercolor pixels] [--bg~| --background color]
         [--bw~| --borderwidth pixels] [--display X-display]
         [--fg~| --foreground color] [--fn~| --ft~| --font font_name]
         [--geometry size_pos] [--resolution value] [--rv] [--title string]
         [--xrm X-resource]

       options for development

         [--debug] [--debug-filenames] [--debug-grog] [--debug-keep]
         [--debug-params] [--debug-tmpdir] [--do-nothing] [--print text] [-V]

       filespec arguments

        The filespec parameters are all arguments that are neither  an  option
        nor  an  option argument.  They usually mean a file name or a man page
        searching scheme.

        In the following, the term section_extension is used.  It means a word
        that  consists  of  a  man  section  that is optionally followed by an
        extension.  The name of a man  section  is  a  single  character  from
        [1-9on], the extension is some word.  The extension is mostly lacking.

        No filespec parameters means standard input.

        -         stands for standard input (can occur several times).

        filename  the path name of an existing file.

        man:name(section_extension)
        man:name.section_extension
        name(section_extension)
        name.section_extension
        section_extension name
                  search  the  man  page  name  in  the  section with optional
                  extension section_extension.

        man:name  man page in the lowest man section that has name.

        name      if name is not an existing file search for the man page name
                  in the lowest man section.

OPTION DETAILS

       The  groffer program can usually be run with very few options.  But for
       special purposes, it supports many options.  These can be classified in
       5 option classes.

       All  short  options of groffer are compatible with the short options of
       groff(1).  All long options of groffer are  compatible  with  the  long
       options of man(1).

       Arguments  for  long  option  names can be abbreviated in several ways.
       First, the argument is checked whether  it  can  be  prolonged  as  is.
       Furthermore,  each minus sign - is considered as a starting point for a
       new abbreviation.  This leads to a set of multiple abbreviations for  a
       single  argument.  For example, --de-n-f can be used as an abbreviation
       for --debug-not-func, but --de-n works as well.  If the abbreviation of
       the argument leads to several resulting options an error is raised.

       These  abbreviations  are  only  allowed  in  the  environment variable
       $GROFFER_OPT, but not in the configuration  files.   In  configuration,
       all long options must be exact.

   groffer breaking Options
       As  soon  as  one  of  these options is found on the command line it is
       executed, printed to  standard  output,  and  the  running  groffer  is
       terminated thereafter.  All other arguments are ignored.

       [-h|--help]
              Print  a  helping information with a short explanation of option
              sto standard output.

       [-v--version]
              Print version information to standard output.

   groffer Mode Options
       The display mode and  the  viewer  programs  are  determined  by  these
       options.  If none of these mode and viewer options is specified groffer
       tries to find a suitable display mode automatically.  The default modes
       are mode pdf, mode ps, mode html, mode x, and mode dvi in X Window with
       different viewers and mode tty with  device  latin1  under  less  on  a
       terminal;  other  modes are tested if the programs for the main default
       mode do not exist.

       In X Window,  many  programs  create  their  own  window  when  called.
       groffer  can  run  these  viewers  as  an  independent  program  in the
       background.  As this does not work in text mode  on  a  terminal  (tty)
       there  must  be  a  way  to  know  which viewers are X Window graphical
       programs.  The groffer script has a small set of  information  on  some
       viewer  names.   If  a  viewer  argument of the command-line chooses an
       element that is kept as X Window program in this list it is treated  as
       a  viewer  that  can  run in the background.  All other, unknown viewer
       calls are not run in the background.

       For each mode, you are free to choose whatever viewer you  want.   That
       need  not  be some graphical viewer suitable for this mode.  There is a
       chance to view the output source; for example, the combination  of  the
       options  --mode=ps  and  --ps-viewer=less  shows  the  content  of  the
       Postscript output, the source code, with the pager less.

       --auto Equivalent to --mode=auto.

       --default
              Reset all configuration from previously processed  command  line
              options  to  the default values.  This is useful to wipe out all
              former  options  of  the  configuration,  in  $GROFFER_OPT,  and
              restart  option  processing  using  only the rest of the command
              line.

       --default-modes mode1,mode2,...
              Set the sequence of modes for auto mode to the  comma  separated
              list  given  in  the argument.  See --mode for details on modes.
              Display in the default manner; actually, this means to  try  the
              modes x, ps, and tty in this sequence.

       --dvi  Equivalent to --mode=dvi.

       --dvi-viewer prog
              Choose  a  viewer program for dvi mode.  This can be a file name
              or a program to be  searched  in  $PATH.   Known  X  Window  dvi
              viewers include xdvi(1) and dvilx(1) In each case, arguments can
              be provided additionally.

       --groff
              Equivalent to --mode=groff.

       --html Equivalent to --mode=html.

       --html-viewer
              Choose a web browser program for viewing in html mode.   It  can
              be  the  path  name of an executable file or a program in $PATH.
              In each case, arguments can be provided additionally.

       --modevalue
              Set the display mode.  The following mode values are recognized:

              auto   Select the automatic determination of the  display  mode.
                     The  sequence of modes that are tried can be set with the
                     --default-modes  option.   Useful   for   restoring   the
                     default mode when a different mode was specified before.

              dvi    Display  formatted  input  in  a  dvi viewer program.  By
                     default,  the  formatted  input  is  displayed  with  the
                     xdvi(1) program.  --dvi.

              groff  After  the  file determination, switch groffer to process
                     the input like groff(1)  would  do.   This  disables  the
                     groffer viewing features.

              html   Translate  the  input  into  html  format and display the
                     result  in  a  web  browser  program.   By  default,  the
                     existence  of  a  sequence  of  standard  web browsers is
                     tested, starting with konqueror(1) and  mozilla(1).   The
                     text html viewer is lynx(1).

              pdf    Display  formatted  input  in  a  PDF  (Portable Document
                     Format)  viewer  program.   By  default,  the  input   is
                     formatted  by  groff using the Postscript device, then it
                     is transformed into the PDF file format using  gs(1),  or
                     ps2pdf(1).   If  that's not possible, the Postscript mode
                     (ps) is used instead.   Finally  it  is  displayed  using
                     different  viewer  programs.   pdf  has  a  big advantage
                     because  the  text  is  displayed  graphically   and   is
                     searchable as well.

              ps     Display  formatted  input in a Postscript viewer program.
                     By default, the formatted input is displayed  in  one  of
                     many viewer programs.

              text   Format  in  a  groff  text  mode  and write the result to
                     standard output without a pager or viewer  program.   The
                     text device, latin1 by default, can be chosen with option
                     -T.

              tty    Format in a groff text  mode  and  write  the  result  to
                     standard  output using a text pager program, even when in
                     X Window.

              www    Equivalent to --mode=html.

              x      Display the formatted input in a native roff viewer.   By
                     default,  the  formatted  input  is  displayed  with  the
                     gxditview(1)  program  being  distributed  together  with
                     groff.   But  the  standard X Window tool xditview(1) can
                     also be chosen with the option --x-viewer .  The  default
                     resolution is 75 dpi, but 100 dpi are also possible.  The
                     default groff device for the  resolution  of  75  dpi  is
                     X75-12,  for 100 dpi it is X100.  The corresponding groff
                     intermediate output for the actual  device  is  generated
                     and  the  result  is  displayed.   For  a  resolution  of
                     100 dpi, the default width of the geometry of the display
                     program is chosen to 850 dpi.

              X      Equivalent to --mode=x.

              The  following  modes  do  not use the groffer viewing features.
              They are only interesting for advanced applications.

              groff  Generate device output with plain groff without using the
                     special  viewing  features  of groffer.  If no device was
                     specified by option -T the groff default ps is assumed.

              source Output the roff source code of the  input  files  without
                     further processing.

       --pdf  Equivalent to --mode=pdf.

       --pdf-viewer prog
              Choose  a  viewer program for pdf mode.  This can be a file name
              or a program to be searched in $PATH; arguments can be  provided
              additionally.

       --ps   Equivalent to --mode=ps.

       --ps-viewer prog
              Choose a viewer program for ps mode.  This can be a file name or
              a program to be searched in $PATH.   Common  Postscript  viewers
              inlude  gv(1),  ghostview(1), and gs(1), In each case, arguments
              can be provided additionally.

       --source
              Equivalent --mode=source.

       --text Equivalent to --mode=text.

       --to-stdout
              The file for the chosen mode is generated  and  its  content  is
              printed  to  standard  output.   It  will  not  be  displayed in
              graphical mode.

       --tty  Equivalent to --mode=tty.

       --tty-viewer prog
              Choose a text  pager  for  mode  tty.   The  standard  pager  is
              less(1).   This  option is eqivalent to man option --pager=prog.
              The option argument can be a  file  name  or  a  program  to  be
              searched in $PATH; arguments can be provided additionally.

       --www  Equivalent to --mode=html.

       --www-viewer prog
              Equivalent to --html-viewer .

       --X~| --x
              Equivalent to --mode=x.

       --X-viewer -- x-viewer prog
              Choose  a  viewer  program for x mode.  Suitable viewer programs
              are gxditview(1) which is  the  default  and  xditview(1).   The
              argument  can  be  any  executable  file  or a program in $PATH;
              arguments can be provided additionally.

       --     Signals the end of option processing;  all  remaining  arguments
              are interpreted as filespec parameters.

       Besides these, groffer accepts all short options that are valid for the
       groff(1) program.  All non-groffer options are sent unmodified via grog
       to  groff.   So  postprocessors,  macro  packages,  compatibility  with
       classical troff, and much more can be manually specified.

   Options related to groff
       All short options of groffer are compatible with the short  options  of
       groff(1).   The  following  of  groff options have either an additional
       special meaning within groffer or make sense for normal usage.

       Because of the special outputting  behavior  of  the  groff  option  -Z
       groffer  was  designed  to  be  switched  into groff mode ; the groffer
       viewing features are disabled there.  The other groff  options  do  not
       switch the mode, but allow to customize the formatting process.

       --a    This   generates   an  ascii  approximation  of  output  in  the
              text modes.  That could be important when  the  text  pager  has
              problems with control sequences in tty mode.

       --mfile
              Add  file  as  a  groff  macro  file.  This is useful in case it
              cannot be recognized automatically.

       --Popt_or_arg
              Send the argument opt_or_arg as an option or option argument  to
              the actual groff postprocessor.

       --T devname ~|  --device devname
              This   option   determines  groff's  output  device.   The  most
              important devices are the text output devices for  referring  to
              the  different  character sets, such as ascii, utf8, latin1, and
              others.   Each  of  these  arguments  switches  groffer  into  a
              text  mode  using this device, to mode tty if the actual mode is
              not a text mode.  The following devname arguments are mapped  to
              the  corresponding groffer --mode=devname option: dvi, html, and
              ps.  All X* arguments are mapped to mode x.  Each other  devname
              argument switches to mode groff using this device.

       --X    is  equivalent  to groff -X.  It displays the groff intermediate
              output with gxditview.  As the quality is  relatively  bad  this
              option is deprecated; use --X instead because the x mode uses an
              X* device for a better display.

       -Z~| --intermediate-output~| --ditroff
              Switch into groff mode and  format  the  input  with  the  groff
              intermediate  output  without  postprocessing; see groff_out(5).
              This is equivalent to option --ditroff of man, which can be used
              as well.

       All  other  groff  options  are supported by groffer, but they are just
       transparently transferred  to  groff  without  any  intervention.   The
       options  that  are  not explicitly handled by groffer are transparently
       passed  to  groff.   Therefore  these  transparent  options   are   not
       documented  here,  but  in groff(1).  Due to the automatism in groffer,
       none of these groff options  should  be  needed,  except  for  advanced
       usage.

   Options for man pages
       --apropos
              Start the apropos(1) command or facility of man(1) for searching
              the filespec arguments within all man page  descriptions.   Each
              filespec argument is taken for search as it is; section specific
              parts are not handled, such that 7 groff searches  for  the  two
              arguments  7  and  groff,  with a large result; for the filespec
              groff.7 nothing will be found.  The language locale  is  handled
              only  when  the called programs do support this; the GNU apropos
              and man -k do not.  The display differs from the apropos program
              by the following concepts:

              o Construct a groff frame similar to a man page to the output of
                apropos,

              o each filespec argument is searched on its own.

              o The restriction by --sections is handled as well,

              o wildcard characters are allowed and handled without a  further
                option.

       --apropos-data
              Show only the apropos descriptions for data documents, these are
              the man(7) sections 4, 5, and 7.   Direct  section  declarations
              are ignored, wildcards are accepted.

       --apropos-devel
              Show  only  the  apropos descriptions for development documents,
              these are the man(7) sections  2,  3,  and  9.   Direct  section
              declarations are ignored, wildcards are accepted.

       --apropos-progs
              Show  only  the  apropos descriptions for documents on programs,
              these are the man(7) sections  1,  6,  and  8.   Direct  section
              declarations are ignored, wildcards are accepted.

       --whatis
              For  each  filespec  argument  search  all man pages and display
              their description -- or say that it is not a man page.  This  is
              written from anew, so it differs from man's whatis output by the
              following concepts

              o each retrieved file name is added,

              o local files are handled as well,

              o the language and system locale is supported,

              o the display is framed by a groff output format  similar  to  a
                man page,

              o wildcard characters are allowed without a further option.

       The  following  options  were added to groffer for choosing whether the
       file name arguments are interpreted as names for local files  or  as  a
       search  pattern  for  man  pages.   The default is looking up for local
       files.

       --man  Check the non-option command line arguments (filespecs) first on
              being  man  pages, then whether they represent an existing file.
              By default, a filespec is first tested whether it is an existing
              file.

       --no-man~| --local-file
              Do  not  check for man pages.  --local-file is the corresponding
              man option.

       --no-special
              Disable former calls of --all , --apropos* , and --whatis .

   Long options taken over from GNU man
       The long options of groffer were synchronized with the long options  of
       GNU  man.   All  long options of GNU man are recognized, but not all of
       these options are important to  groffer,  so  most  of  them  are  just
       ignored.   These  ignored  man  options  are  --catman  , --troff , and
       --update .

       In the following, the man options  that  have  a  special  meaning  for
       groffer are documented.

       If  your  system  has  GNU man installed the full set of long and short
       options of the GNU man  program  can  be  passed  via  the  environment
       variable $MANOPT; see man(1).

       --all  In  searching man pages, retrieve all suitable documents instead
              of only one.

       -7--ascii
              In text modes, display ASCII translation of  special  characters
              for   critical   environment.    This  is  equivalent  to  groff
              -mtty_char; see groff_tmac(5).

       --ditroff
              Produce  groff  intermediate  output.   This  is  equivalent  to
              groffer -Z .

       --extensionsuffix
              Restrict man page search to file names that have suffix appended
              to their  section  element.   For  example,  in  the  file  name
              /usr/share/man/man3/terminfo.3ncurses.gz  the man page extension
              is ncurses.

       --localelanguage
              Set the language for man pages.  This has the same  effect,  but
              overwrites $LANG

       --location
              Print the location of the retrieved files to standard error.

       --no-location
              Do  not  display  the location of retrieved files; this resets a
              former call to --location .  This was added by groffer.

       --manpath'dir1:dir2:...'
              Use the specified search path for retrieving man  pages  instead
              of  the  program  defaults.  If the argument is set to the empty
              string "" the search for man page is disabled.

       --pager
              Set the pager program in tty mode; default  is  less.   This  is
              equivalent to --tty-viewer .

       --sections'sec1:sec2:...'
              Restrict searching for man pages to the given sections, a colon-
              separated list.

       --systems'sys1,sys2,...'
              Search for man  pages  for  the  given  operating  systems;  the
              argument systems is a comma-separated list.

       --where
              Eqivalent to --location .

   X Window Toolkit Options
       The   following  long  options  were  adapted  from  the  corresponding
       X Window Toolkit options.  groffer will pass them to the actual  viewer
       program  if  it  is  an  X Window program.  Otherwise these options are
       ignored.

       Unfortunately these options use the old style of  a  single  minus  for
       long  options.  For groffer that was changed to the standard with using
       a double minus for long options, for example, groffer uses  the  option
       --font for the X Window option -font .

       See X(7) and the documentation on the X Window Toolkit options for more
       details on these options and their arguments.

       --backgroundcolor
              Set the background color of the viewer window.

       --bdpixels
              This is equivalent to --bordercolor .

       --bgcolor
              This is equivalent to --background .

       --bw pixels
              This is equivalent to --borderwidth .

       --bordercolorpixels
              Specifies the color of the border surrounding the viewer window.

       --borderwidthpixels
              Specifies the width in pixels  of  the  border  surrounding  the
              viewer window.

       --displayX-display
              Set  the  X  Window display on which the viewer program shall be
              started, see the X Window documentation for the  syntax  of  the
              argument.

       --foregroundcolor
              Set the foreground color of the viewer window.

       --fgcolor
              This is equivalent to -foreground .

       --fn font_name
              This is equivalent to --font .

       --fontfont_name
              Set  the  font  used  by  the viewer window.  The argument is an
              X Window font name.

       --ftfont_name
              This is equivalent to --font .

       --geometrysize_pos
              Set the geometry of the display window, that means its size  and
              its starting position.  See X(7) for the syntax of the argument.

       --resolutionvalue
              Set  X  Window  resolution in dpi (dots per inch) in some viewer
              programs.  The  only  supported  dpi  values  are  75  and  100.
              Actually,  the  default resolution for groffer is set to 75 dpi.
              The resolution also sets the default device in mode x.

       --rv   Reverse foreground and background color of the viewer window.

       --title'some text'
              Set the title for the viewer window.

       --xrm'resource'
              Set X Window resource.

   Options for Development
       --debug
              Enable all debugging options --debug-type .  The temporary files
              are  kept  and not deleted, the grog output is printed, the name
              of the temporary directory is printed, the displayed file  names
              are printed, and the parameters are printed.

       --debug-filenames
              Print the names of the files and man pages that are displayed by
              groffer.

       --debug-grog
              Print the output of all grog commands.

       --debug-keep
              Enable two  debugging  informations.   Print  the  name  of  the
              temporary  directory and keep the temporary files, do not delete
              them during the run of groffer.

       --debug-params
              Print the parameters, as obtained from the configuration  files,
              from GROFFER_OPT, and the command line arguments.

       --debug-tmpdir
              Print the name of the temporary directory.

       --do-nothing
              This  is  like  --version , but without the output; no viewer is
              started.  This makes only sense in development.

       --print=text
              Just print the argument to standard error.   This  is  good  for
              parameter check.

       -V     This  is  an  advanced  option  for  debugging only.  Instead of
              displaying the  formatted  input,  a  lot  of  groffer  specific
              information is printed to standard output:

              o the output file name in the temporary directory,

              o the display mode of the actual groffer run,

              o the display program for viewing the output with its arguments,

              o the  active parameters from the config files, the arguments in
                $GROFFER_OPT, and the arguments of the command line,

              o the pipeline that would be  run  by  the  groff  program,  but
                without executing it.

       Other   useful   debugging   options   are  the  groff  option  -Z  and
       --mode=groff.

   Filespec Arguments
       A filespec parameter is an argument that is not  an  option  or  option
       argument.   In  groffer,  filespec  parameters  are  a  file  name or a
       template for searching man pages.  These input  sources  are  collected
       and composed into a single output file such as groff does.

       The  strange  POSIX  behavior  to regard all arguments behind the first
       non-option argument as filespec arguments is ignored.  The GNU behavior
       to  recognize  options  even when mixed with filespec arguments is used
       througout.  But, as usual, the double minus argument -- ends the option
       handling  and interprets all following arguments as filespec arguments;
       so the POSIX behavior can be easily adopted.

       The options --apropos* have a special handling of  filespec  arguments.
       Each  argument  is  taken as a search scheme of its own.  Also a regexp
       (regular expression) can be used in the filespec.  For example, groffer
       --apropos  '^gro.f$' searches groff in the man page name, while groffer
       --apropos groff searches groff somewhere in the name or description  of
       the man pages.

       All  other  parts  of groffer, such as the normal display or the output
       with --whatis have  a  different  scheme  for  filespecs.   No  regular
       expressions  are  used  for  the arguments.  The filespec arguments are
       handled by the following scheme.

       It is necessary to know that on each system the man  pages  are  sorted
       according  to  their  content into several sections.  The classical man
       sections have a single-character name, either a digit from 1  to  9  or
       one of the characters n or o.

       This  can  optionally be followed by a string, the so-called extension.
       The extension allows to store several man pages with the same  name  in
       the same section.  But the extension is only rarely used, usually it is
       omitted.  Then the extensions are searched automatically by alphabet.

       In the following, we use the name section_extension  for  a  word  that
       consists of a single character section name or a section character that
       is followed by an extension.  Each filespec parameter can have  one  of
       the following forms in decreasing sequence.

       o No  filespec  parameters means that groffer waits for standard input.
         The minus option - always stands for standard  input;  it  can  occur
         several  times.   If  you want to look up a man page called - use the
         argument man:-.

       o Next a filespec is tested whether it is the path name of an  existing
         file.   Otherwise  it  is  assumed  to  be  a searching pattern for a
         man page.

       o man:name(section_extension),              man:name.section_extension,
         name(section_extension),   or   name.section_extension   search   the
         man  page  name  in   man   section   and   possibly   extension   of
         section_extension.

       o Now  man:name  searches for a man page in the lowest man section that
         has a document called name.

       o section_extension name is a pattern of 2  arguments  that  originates
         from  a  strange  argument  parsing  of the man program.  Again, this
         searches the man page name with section_extension, a combination of a
         section character optionally followed by an extension.

       o We are left with the argument name which is not an existing file.  So
         this searches for the man page called name in the lowest man  section
         that has a document for this name.

       Several  file  name arguments can be supplied.  They are mixed by groff
       into a single document.  Note that the set of option arguments must fit
       to  all of these file arguments.  So they should have at least the same
       style of the groff language.

OUTPUT MODES

       By default, the groffer program collects all input into a single  file,
       formats  it  with  the  groff  program  for  a certain device, and then
       chooses a suitable viewer program.  The device and  viewer  process  in
       groffer  is  called  a  mode.  The mode and viewer of a running groffer
       program is selected automatically, but the user can also choose it with
       options.    The   modes   are  selected  by  option  the  arguments  of
       --mode=anymode.  Additionally, each of this argument can  be  specified
       as  an  option of its own, such as anymode.  Most of these modes have a
       viewer program, which can be chosen by an option  that  is  constructed
       like --anymode-viewer.

       Several  different  modes  are  offered,  graphical modes for X Window,
       text modes, and some direct groff modes for debugging and development.

       By default, groffer first  tries  whether  x  mode  is  possible,  then
       ps  mode,  and  finally  tty  mode.   This  mode  testing  sequence for
       auto mode can be changed by specifying a comma separated list of  modes
       with the option --default-modes.

       The  searching  for  man  pages  and the decompression of the input are
       active in every mode.

   Graphical Display Modes
       The graphical display modes work mostly in the X Window environment (or
       similar  implementations  within  other  windowing  environments).  The
       environment variable $DISPLAY and the option  --display  are  used  for
       specifying  the  X  Window  display  to  be  used.  If this environment
       variable is empty groffer assumes that  no  X  Window  is  running  and
       changes  to a text mode.  You can change this automatic behavior by the
       option --default-modes.

       Known viewers for  the  graphical  display  modes  and  their  standard
       X Window viewer progams are

       o in a PDF viewer (pdf mode),

       o in a web browser (html or www mode).

       o in a Postscript viewer (ps mode),

       o X  Window  roff  viewers  such  as  gxditview(1)  or  xditview(1) (in
         x mode),

       o in a dvi viewer program (dvi mode),

       The pdf mode has a major advantage -- it is the only  graphical  diplay
       mode  that  allows  to search for text within the viewer; this can be a
       really  important  feature.   Unfortunately,  it  takes  some  time  to
       transform  the  input  into the PDF format, so it was not chosen as the
       major mode.

       These  graphical  viewers  can  be  customized  by   options   of   the
       X  Window  Toolkit.  But the groffer options use a leading double minus
       instead of the single minus used by the X Window Toolkit.

   Text modes
       There are two modes for text output, mode text for plain output without
       a  pager  and  mode tty for a text output on a text terminal using some
       pager program.

       If the variable $DISPLAY is not set or empty, groffer assumes  that  it
       should use tty mode.

       In  the actual implementation, the groff output device latin1 is chosen
       for text modes.  This  can  be  changed  by  specifying  option  -T  or
       --device.

       The pager to be used can be specified by one of the options --pager and
       --tty-viewer, or by the environment variable $PAGER.  If all of this is
       not  used  the  less(1)  program  with  the  option  -r  for  correctly
       displaying control sequences is used as the default pager.

   Special Modes for Debugging and Development
       These modes use the groffer file determination and decompression.  This
       is  combined  into  a single input file that is fed directly into groff
       with different strategy without the groffer viewing facilities.   These
       modes  are  regarded  as  advanced,  they  are useful for debugging and
       development purposes.

       The source mode with option --source  just  displays  the  decompressed
       input.

       Otion  --to-stdout  does  not  display  in  a  graphical mode.  It just
       generates the file for the chosen mode and then prints its  content  to
       standard output.

       The  groff  mode  passes  the  input  to groff using only some suitable
       options provided to  groffer.   This  enables  the  user  to  save  the
       generated output into a file or pipe it into another program.

       In  groff  mode, the option -Z disables post-processing, thus producing
       the groff intermediate output.  In this mode, the input  is  formatted,
       but not postprocessed; see groff_out(5) for details.

       All groff short options are supported by groffer.

MAN PAGE SEARCHING

       The  default  behavior  of  groffer  is  to  first  test whether a file
       parameter represents a local file; if it is not an existing file  name,
       it  is  assumed  to  represent  the  name of a man page.  The following
       options can be used  to  determine  whether  the  arguments  should  be
       handled as file name or man page arguments.

       --man  forces  to  interpret  all  file  parameters  as  filespecs  for
              searching man pages.

       --no-man
       --local-file
              disable the man searching; so only local files are displayed.

       If neither a local file nor a man page  was  retrieved  for  some  file
       parameter  a  warning  is  issued  on standard error, but processing is
       continued.

   Search Algoritm
       Let us now assume that a man page  should  be  searched.   The  groffer
       program  provides  a  search facility for man pages.  All long options,
       all environment variables, and most of the  functionality  of  the  GNU
       man(1)  program were implemented.  The search algorithm shall determine
       which file is displayed for a given  man  page.   The  process  can  be
       modified by options and environment variables.

       The  only  man  action  that is omitted in groffer are the preformatted
       man pages, also called cat pages.  With the  excellent  performance  of
       the  actual  computers, the preformatted man pages aren't necessary any
       longer.  Additionally, groffer is a roff program; it wants to read roff
       source files and format them itself.

       The  algorithm for retrieving the file for a man page needs first a set
       of directories.  This set starts with the so-called man  path  that  is
       modified  later  on  by  adding names of operating system and language.
       This arising set is used  for  adding  the  section  directories  which
       contain the man page files.

       The  man path is a list of directories that are separated by colon.  It
       is generated by the following methods.

       o The environment variable $MANPATH can be set.

       o It can be  read  from  the  arguments  of  the  environment  variable
         $MANOPT.

       o The man path can be manually specified by using the option --manpath.
         An empty argument disables the man page searching.

       o When no man path was set the manpath(1) program is tried to determine
         one.

       o If  this  does  not  work  a  reasonable  default  path from $PATH is
         determined.

       We now have a starting set of directories.  The  first  way  to  change
       this  set  is  by adding names of operating systems.  This assumes that
       man pages for several operating systems are  installed.   This  is  not
       always  true.  The names of such operating systems can be provided by 3
       methods.

       o The environment variable $SYSTEM has the lowest precedence.

       o This can be overridden by an option in $MANOPT.

       o This again is overridden by the command line option --systems.

       Several names of operating systems can  be  given  by  appending  their
       names, separated by a comma.

       The  man  path is changed by appending each system name as subdirectory
       at the end of each directory of the set.  No directory of the man  path
       set  is  kept.  But if no system name is specified the man path is left
       unchanged.

       After this, the actual set of directories can be  changed  by  language
       information.   This  assumes  that  there  exist man pages in different
       languages.  The wanted language can be chosen by several methods.

       o Enviroment variable $LANG.

       o This is overridden by $LC_MESSAGES.

       o This is overridden by $LC_ALL.

       o This can be overridden by providing an option in $MANOPT.

       o All these environment variables are overridden by  the  command  line
         option --locale.

       The  default language can be specified by specifying one of the pseudo-
       language parameters C or POSIX.  This is like deleting a formerly given
       language  information.   The  man  pages  in  the  default language are
       usually in English.

       Of course, the language name is determined by man.  In GNU man,  it  is
       specified in the POSIX 1003.1 based format:

       <language>[_<territory>[.<character-set>[,<version>]]],

       but  the two-letter code in <language> is sufficient for most purposes.
       If for a complicated  language  formulation  no  man  pages  are  found
       groffer  searches  the  country  part  consisting  of  these  first two
       characters as well.

       The actual directory set  is  copied  thrice.   The  language  name  is
       appended  as  subdirectory  to  each directory in the first copy of the
       actual directory set (this is only done when a language information  is
       given).   Then  the  2-letter  abbreviation  of  the  language  name is
       appended as subdirectories to the second  copy  of  the  directory  set
       (this  is  only  done  when  the  given  language  name has more than 2
       letters).  The third copy of the directory set is kept unchanged (if no
       language  information  is given this is the kept directory set).  These
       maximally 3 copies are appended to get the new directory set.

       We now have a complete set of directories to work  with.   In  each  of
       these  directories,  the man files are separated in sections.  The name
       of a section is represented by a single character, a  digit  between  1
       and 9, or the character o or n, in this order.

       For   each   available  section,  a  subdirectory  man<section>  exists
       containing all man files for this section, where <section> is a  single
       character  as  described  before.  Each man file in a section directory
       has                              the                               form
       man<section>/<name>.<section>[<extension>][.<compression>],       where
       <extension> and <compression> are optional.  <name> is the name of  the
       man  page  that  is  also specified as filespec argument on the command
       line.

       The extension is an addition to the section.  This postfix acts like  a
       subsection.   An extension occurs only in the file name, not in name of
       the section subdirectory.  It can be specified on the command line.

       On the other hand, the compression is just an information  on  how  the
       file  is  compressed.  This is not important for the user, such that it
       cannot be specified on the command line.

       There are 4 methods to specify a section on the command line:

       o Environment variable $MANSECT

       o Command line option --sections

       o Appendix to the name argument in the form <name>.<section>

       o Preargument before the name argument in the form <section> <name>

       It is also possible to specify several sections by appending the single
       characters  separated  by  colons.   One can imagine that this means to
       restrict the man page search  to  only  some  sections.   The  multiple
       sections are only possible for $MANSECT and --sections.

       If  no  section  is  specified  all sections are searched one after the
       other in the given order, starting with section  1,  until  a  suitable
       file is found.

       There  are  4 methods to specify an extension on the command line.  But
       it  is  not  necessary  to  provide  the  whole  extension  name,  some
       abbreviation is good enough in most cases.

       o Environment variable $EXTENSION

       o Command line option --extension

       o Appendix    to    the   <name>.<section>   argument   in   the   form
         <name>.<section><extension>

       o Preargument before the name argument in the form <section><extension>
         <name>

       For further details on man page searching, see man(1).

   Examples of man files
       /usr/share/man/man1/groff.1
              This  is  an  uncompressed  file  for  the  man  page  groff  in
              section 1.  It can be called by
              sh# groffer groff
              No  section  is  specified  here,  so  all  sections  should  be
              searched,  but  as section 1 is searched first this file will be
              found first.   The  file  name  is  composed  of  the  following
              components.   /usr/share/man  must  be part of the man path; the
              subdirectory man1/ and the part .1 stand for the section;  groff
              is the name of the man page.

       /usr/local/share/man/man7/groff.7.gz
              The   file   name  is  composed  of  the  following  components.
              /usr/local/share/man  must  be  part  of  the  man   path;   the
              subdirectory  man7/ and the part .7 stand for the section; groff
              is the name of the man page; the final part  .gz  stands  for  a
              compression  with  gzip(1).  As the section is not the first one
              it must be specified as well.  This can be done by  one  of  the
              following commands.
              sh# groffer groff.7
              sh# groffer 7 groff
              sh# groffer --sections=7 groff

       /usr/local/man/man1/ctags.1emacs21.bz2
              Here  /usr/local/man must be in man path; the subdirectory man1/
              and the file name part .1 stand for section 1; the name  of  the
              man page is ctags; the section has an extension emacs21; and the
              file is compressed as .bz2  with  bzip2(1).   The  file  can  be
              viewed with one of the following commands
              sh# groffer ctags.1e
              sh# groffer 1e ctags
              sh# groffer --extension=e --sections=1 ctags
              where e works as an abbreviation for the extension emacs21.

       /usr/man/linux/de/man7/man.7.Z
              The  directory  /usr/man is now part of the man path; then there
              is a subdirectory for an  operating  system  name  linux/;  next
              comes   a  subdirectory de/ for the German language; the section
              names man7 and .7 are known so far;  man  is  the  name  of  the
              man  page;  and .Z signifies the compression that can be handled
              by gzip(1).  We want now show how to provide several values  for
              some  options.   That  is  possible  for  sections and operating
              system names.  So we use as sections 5 and 7 and as system names
              linux and aix.  The command is then

              sh# groffer --locale=de --sections=5:7 --systems=linux,aix man
              sh# LANG=de MANSECT=5:7 SYSTEM=linux,aix groffer man

DECOMPRESSION

       The  program has a decompression facility.  If standard input or a file
       that was retrieved from the command line parameters is compressed  with
       a  format  that  is  supported  by  either  gzip(1)  or  bzip2(1) it is
       decompressed on-the-fly.  This includes the  GNU  .gz,  .bz2,  and  the
       traditional  .Z compression.  The program displays the concatenation of
       all decompressed input in  the  sequence  that  was  specified  on  the
       command line.

ENVIRONMENT

       The  groffer  program  supports  many system variables, most of them by
       courtesy of other programs.  All environment variables of groff(1)  and
       GNU man(1) and some standard system variables are honored.

   Native groffer Variables
       $GROFFER_OPT
              Store  options  for  a run of groffer.  The options specified in
              this variable are overridden by the options given on the command
              line.   The  content  of  this variable is run through the shell
              builtin `eval'; so arguments containing white-space  or  special
              shell characters should be quoted.  Do not forget to export this
              variable, otherwise it does not exist during the run of groffer.

   System Variables
       The following variables have a special meaning for groffer.

       $DISPLAY
              If this variable is set this indicates that the X Window  system
              is  running.  Testing this variable decides on whether graphical
              or text output  is  generated.   This  variable  should  not  be
              changed  by the user carelessly, but it can be used to start the
              graphical groffer on a remote X Window terminal.   For  example,
              depending  on  your system, groffer can be started on the second
              monitor by the command

              sh# DISPLAY=:0.1 groffer  what.ever &

       $LC_ALL
       $LC_MESSAGES
       $LANG  If one of these variables is set (in the  above  sequence),  its
              content  is  interpreted as the locale, the language to be used,
              especially  when  retrieving  man  pages.   A  locale  name   is
              typically of the form language[_territory[.codeset[@modifier]]],
              where language is an ISO 639 language code, territory is an  ISO
              3166  country  code,  and codeset is a character set or encoding
              identifier like ISO-8859-1  or  UTF-8;  see  setlocale(3).   The
              locale  values  C  and  POSIX  stand  for  the default, i.e. the
              man page directories without a language  prefix.   This  is  the
              same behavior as when all 3 variables are unset.

       $PAGER This  variable  can be used to set the pager for the tty output.
              For example, to disable the use of a pager completely  set  this
              variable to the cat(1) program

              sh# PAGER=cat groffer  anything

       $PATH  All  programs  within  the  groffer  script are called without a
              fixed path.  Thus this environment variable determines  the  set
              of programs used within the run of groffer.

   Groff Variables
       The   groffer  program  internally  calls  groff,  so  all  environment
       variables documented in groff(1) are internally used within groffer  as
       well.   The  following  variable  has  a direct meaning for the groffer
       program.

       $GROFF_TMPDIR
              If  the  value  of  this  variable  is  an  existing,   writable
              directory, groffer uses it for storing its temporary files, just
              as groff does.  See the groff(1) man page for  more  details  on
              the location of temporary files.

   Man Variables
       Parts  of  the  functionality  of  the  man program were implemented in
       groffer; support for all environment variables documented in man(1) was
       added  to  groffer,  but  the  meaning was slightly modified due to the
       different approach in groffer; but the user interface is the same.  The
       man  environment  variables can be overwritten by options provided with
       $MANOPT, which in turn is overwritten by the command line.

       $EXTENSION
              Restrict  the  search  for  man  pages  to  files  having   this
              extension.   This is overridden by option --extension; see there
              for details.

       $MANOPT
              This variable contains options as a preset for man(1).   As  not
              all  of  these are relevant for groffer only the essential parts
              of its value are  extracted.   The  options  specified  in  this
              variable overwrite the values of the other environment variables
              that are  specific  to  man.   All  options  specified  in  this
              variable  are  overridden  by  the  options given on the command
              line.

       $MANPATH
              If set, this variable contains  the  directories  in  which  the
              man  page  trees  are  stored.   This  is  overridden  by option
              --manpath.

       $MANSECT
              If this is a colon separated list of section names,  the  search
              for  man  pages  is  restricted to those manual sections in that
              order.  This is overridden by option --sections.

       $SYSTEM
              If this is set to a comma separated  list  of  names  these  are
              interpreted  as  man page trees for different operating systems.
              This variable can be overwritten by option --systems; see  there
              for details.

       The  environment variable $MANROFFSEQ is ignored by groffer because the
       necessary preprocessors are determined automatically.

CONFIGURATION FILES

       The groffer program can be preconfigured by two configuration files.

       /etc/groff/groffer.conf
              System-wide configuration file for groffer.

       $HOME/.groff/groffer.conf
              User-specific  configuration  file  for  groffer,  where   $HOME
              denotes  the  user's  home directory.  This file is called after
              the system-wide configuration file to enable overriding  by  the
              user.

       Both  files  are  handled  for the configuration, but the configuration
       file in /etc comes first; it is overwritten by the  configuration  file
       in  the home directory; both configuration files are overwritten by the
       environment variable $GROFFER_OPT; everything  is  overwritten  by  the
       command line arguments.

       The  configuration  files  contain  options  that  should  be called as
       default for every groffer run.  These options are written in lines such
       that  each  contains  either  a long option, a short option, or a short
       option cluster; each with or without an argument.  So  each  line  with
       configuration  information  starts  with  a minus character `-'; a line
       with a long option starts with two minus characters `--', a line with a
       short option or short option cluster starts with a single minus `-'.

       The  option  names  in  the configuration files may not be abbreviated,
       they must be exact.

       The argument for a long option can be separated from  the  option  name
       either by an equal sign `=' or by whitespace, i.e. one or several space
       or tab characters.  An argument for a  short  option  or  short  option
       cluster  can  be  directly  appended to the option name or separated by
       whitespace.  The end of an argument is the end of the line.  It is  not
       allowed  to  use  a  shell  environment  variable  in an option name or
       argument.

       It is not necessary to use quotes in an option or argument, except  for
       empty arguments.  An empty argument can be provided by appending a pair
       of quotes to the separating equal sign  or  whitespace;  with  a  short
       option, the separator can be omitted as well.  For a long option with a
       separating equal sign `=', the pair of  quotes  can  be  omitted,  thus
       ending  the  line  with  the  separating  equal  sign.  All other quote
       characters are cancelled internally.

       In the configuration files, arbitrary  whitespace  is  allowed  at  the
       beginning  of  each line, it is just ignored.  Each whitespace within a
       line is replaced by a single space character ` ' internally.

       All lines of the configuration lines that do not  start  with  a  minus
       character  are  ignored,  such  that  comments  starting  with  `#' are
       possible.  So there are no shell commands in the configuration files.

       As an example, consider the following configuration file  that  can  be
       used either in /etc/groff/groffer.conf or ~/.groff/groffer.conf.

       # groffer configuration file
       #
       # groffer options that are used in each call of groffer
       --foreground=DarkBlue
       --resolution 100
       --x-viewer=gxditview -geometry 900x1200
       --pdf-viewer xpdf -z 150

       The  lines  starting  with  #  are just ignored, so they act as command
       lines.   This  configuration  sets  four  groffer  options  (the  lines
       starting with `-').  This has the following effects:

       o Use  a  text color of DarkBlue in all viewers that support this, such
         as gxditview.

       o Use a resolution of 100 dpi in all viewers that support this, such as
         gxditview.  By this, the default device in x mode is set to X100.

       o Force gxditview(1) as the x-mode viewer using the geometry option for
         setting the width to 900 dpi  and  the  height  to  1200  dpi.   This
         geometry is suitable for a resolution of 100 dpi.

       o Use xpdf(1) as the pdf-mode viewer with the argument -Z 150.

EXAMPLES

       The  usage  of groffer is very easy.  Usually, it is just called with a
       file name or man page.  The  following  examples,  however,  show  that
       groffer has much more fancy capabilities.
       sh# groffer /usr/local/share/doc/groff/meintro.ms.gz
       Decompress, format and display the compressed file meintro.ms.gz in the
       directory  /usr/local/share/doc/groff,  using   the   standard   viewer
       gxditview  as  graphical  viewer when in X Window, or the less(1) pager
       program when not in X Window.

       sh# groffer groff

       If the file ./groff exists use it as input.   Otherwise  interpret  the
       argument  as  a  search  for  the  man page named groff in the smallest
       possible man section, being section 1 in this case.

       sh# groffer man:groff

       search for the man page of groff even when the file ./groff exists.

       sh# groffer groff.7
       sh# groffer 7 groff

       search the man page of groff in man section  7.   This  section  search
       works only for a digit or a single character from a small set.

       sh# groffer fb.modes

       If  the  file  ./fb.modes does not exist interpret this as a search for
       the man page of fb.modes.  As the  extension  modes  is  not  a  single
       character  in  classical  section  style the argument is not split to a
       search for fb.

       sh# groffer groff 'troff(1)' man:roff

       The arguments  that  are  not  existing  files  are  looked-up  as  the
       following  man  pages:  groff  (automatic  search,  should  be found in
       man section 1), troff (in section 1), and roff (in the section with the
       lowest number, being 7 in this case).  The quotes around 'troff(1)' are
       necessary  because  the  paranthesis  are  special  shell   characters;
       escaping  them  with a backslash character \( and \) would be possible,
       too.  The formatted files are concatenated and displayed in one piece.

       sh# LANG=de groffer --man --www --www-viever=galeon ls

       Retrieve the  German  man  page  (language  de)  for  the  ls  program,
       decompress  it, format it to html format (www mode) and view the result
       in the web browser  galeon.   The  option  --man  guarantees  that  the
       man  page  is retrieved, even when a local file ls exists in the actual
       directory.

       sh# groffer --source 'man:roff(7)'

       Get the man page called roff in man section 7, decompress it, and print
       its unformatted content, its source code.

       sh# groffer --de-p --in --ap

       This is a set of abbreviated arguments, it is determined as

       sh# groffer --debug-params --intermediate-output --apropos

       sh# cat file.gz | groffer -Z -mfoo"

       The  file  file.gz is sent to standard input, this is decompressed, and
       then this is transported to the groff intermediate output mode  without
       post-processing  (groff  option  -Z  ),  using macro package foo (groff
       option -m ) .

       sh# echo '\f[CB]WOW!' |
       > groffer --x --bg red --fg yellow --geometry 200x100 -

       Display the word WOW! in a small window in constant-width
       bold font, using color yellow on red background.

COMPATIBILITY

       The groffer program is written in Perl, the Perl version during writing
       was v5.8.8.

       groffer  provides  its  own  parser  for command line arguments that is
       compatible to both POSIX getopts(1) and GNU getopt(1).  It  can  handle
       option  arguments and file names containing white space and a large set
       of special characters.  The following standard  types  of  options  are
       supported.

       o The option consisting of a single minus - refers to standard input.

       o A  single  minus  followed by characters refers to a single character
         option or a combination  thereof;  for  example,  the  groffer  short
         option combination -Qmfoo is equivalent to -Q -m foo .

       o Long  options  are options with names longer than one character; they
         are always preceded by a double minus.  An option argument can either
         go  to  the  next  command line argument or be appended with an equal
         sign to the  argument;  for  example,  --long=arg  is  equivalent  to
         --long arg.

       o An  argument  of  --  ends  option  parsing; all further command line
         arguments are interpreted as filespec parameters, i.e. file names  or
         constructs for searching man pages).

       o All  command  line  arguments  that  are  neither  options nor option
         arguments are interpreted as filespec  parameters  and  stored  until
         option parsing has finished.  For example, the command line

         sh# groffer file1 -a -o arg file2

         is equivalent to

         sh# groffer -a -o arg -- file1 file2

       The  free  mixing  of  options  and filespec parameters follows the GNU
       principle.  That does not fulfill the strange option behavior of  POSIX
       that  ends  option  processing as soon as the first non-option argument
       has been reached.  The end of option processing can be  forced  by  the
       option `--' anyway.

BUGS

       Report bugs to the bug-groff mailing list <bug-groff@gnu.org>.  Include
       a complete, self-contained example  that  will  allow  the  bug  to  be
       reproduced, and say which version of groffer you are using.

       You  can  also use the groff mailing list <groff@gnu.org>, but you must
       first subscribe to this list.  You can do that by  visiting  the  groff
       mailing list web page <http://lists.gnu.org/mailman/listinfo/groff>.

       See groff(1) for information on availability.

SEE ALSO

       groff(1), troff(1)
              Details  on  the  options and environment variables available in
              groff; all of them can be used with groffer.

       groff(7)
              Documentation of the groff language.

       grog(1)
              Internally, groffer  tries  to  guess  the  groff  command  line
              options from the input using this program.

       chem(1)
              Preprocessor of groff that is run automatically.

       groff_out(5)
              Documentation on the groff intermediate output (ditroff output).

       groff_tmac(5)
              Documentation on the groff macro files.

       man(1) The  standard  program  to  display  man pages.  The information
              there is only useful if it is the man page for GNU man.  Then it
              documents   the  options  and  environment  variables  that  are
              supported by groffer.

       gxditview(1), xditview(1x)
              Viewers for groffer's x mode.

       kpdf(1), kghostview(1), evince(1), ggv(1), gv(1), ghostview(1), gs(1)
              Viewers for groffer's ps mode.

       kpdf(1),  acroread(1),  evince(1),  xpdf(1),  gpdf(1),   kghostview(1),
       ggv(1)
              Viewers for groffer's pdf mode.

       kdvi(1), xdvi(1), dvilx(1)
              Viewers for groffer's dvi mode.

       konqueror(1), epiphany(1), firefox(1), mozilla(1), netscape(1), lynx(1)
              Web-browsers for groffer's html or www mode.

       less(1)
              Standard pager program for the tty mode .

       gzip(1), bzip2(1)
              The decompression programs supported by groffer.

AUTHOR

       This file was written by Bernd Warken.

COPYING

       Copyright (C) 2001, 2002, 2004, 2005, 2006, 2009, 2010
         Free Software Foundation, Inc.

       This  file  is part of groffer, which is part of groff, a free software
       project.  You can redistribute it and/or modify it under the  terms  of
       the  GNU  General  Public  License  as  published  by the Free Software
       Foundation, either version 3 of the License, or (at  your  option)  any
       later version.

       You should have received a copy of the GNU General Public License along
       with groff, see the files COPYING and LICENSE in the top  directory  of
       the  groff  source package.  Or read the man page gpl(1).  You can also
       visit <http://www.gnu.org/licenses/>.