Provided by: groff-base_1.22.4-6_amd64 bug

NAME

       grotty - groff driver for typewriter-like devices

SYNOPSIS

       grotty [-bBcdfhioruUv] [-F dir] [file ...]

DESCRIPTION

       grotty  translates  the  output  of  GNU  troff  into  a form suitable for typewriter-like
       devices.  Normally grotty should be invoked by using the groff  command  with  a  -Tascii,
       -Tlatin1  or  -Tutf8 option on ASCII based systems, and with -Tcp1047 and -Tutf8 on EBCDIC
       based hosts.  If no files are given, grotty reads the standard input.   A  filename  of  -
       also causes grotty to read the standard input.  Output is written to the standard output.

       By  default,  grotty  emits  SGR  escape  sequences (from ISO 6429, also called ANSI color
       escapes) to change text attributes (bold, italic, colors).  This makes it possible to have
       eight different background and foreground colors; additionally, bold and italic attributes
       can be used at the same time (by using the BI font).

       The following colors are defined in tty.tmac: black,  white,  red,  green,  blue,  yellow,
       magenta,  cyan.  Unknown colors are mapped to the default color (which is dependent on the
       settings of the terminal; in most cases, this is black for the foreground  and  white  for
       the background).

       Use  the  -c  switch  to revert to the old behaviour, printing a bold character c with the
       sequence “c BACKSPACE c” and an italic character c by the sequence “_  BACKSPACE  c”.   At
       the  same  time,  color  output  is  disabled.  The same effect can be achieved by setting
       either the GROFF_NO_SGR environment variable or using the ‘sgr’ X command (see below).

       (Debian-specific: The old behaviour is the default when  using  the  man  and  mdoc  macro
       packages,  because  most  pagers  either  fail  to  cope with SGR escape sequences or need
       special  options  to  do  so.   SGR  output  can  be  re-enabled  permanently  by  editing
       /etc/groff/man.local  and  /etc/groff/mdoc.local,  or temporarily by setting the GROFF_SGR
       environment variable to something non-empty.)

       For SGR support, it is  necessary  to  use  the  -R  option  of  less(1)  to  disable  the
       interpretation  of  grotty's old output format.  Consequently, all programs which use less
       as the pager program have to pass this option to it.  For man(1) in particular, either add
       -R to the PAGER environment variable, e.g.

              PAGER="/usr/bin/less -R"
              export PAGER

       or  use  the  -P  option of man to set the pager executable and its options, or modify the
       configuration file of man in a similar fashion.  Note that with some man(1) versions,  you
       have to use the MANPAGER environment variable instead.

       grotty's old output format can be displayed on a terminal by piping through ul(1).  Pagers
       such as more(1) or less(1) are also able to display these sequences.  Use either -B or  -U
       when piping into less(1); use -b when piping into more(1).  There is no need to filter the
       output through col(1) since grotty never outputs reverse line feeds.

       The font description file may contain a command

              internalname n

       where n is a decimal integer.  If the 01 bit in n is set, then the font is treated  as  an
       italic  font;  if the 02 bit is set, then it is treated as a bold font.  The code field in
       the font description field gives the code which is used to  output  the  character.   This
       code can also be used in the \N escape sequence in troff.

       If  the  DESC  file contains the keyword unicode, grotty emits Unicode characters in UTF-8
       encoding.  Otherwise, it emits characters in a single-byte encoding depending on the  data
       in the font description files.  See the groff_font(5) man page for more details.

OPTIONS

       Whitespace is permitted between a command-line option and its argument.

       -b     Suppress the use of overstriking for bold characters.  Ignored if -c isn't used.

       -B     Use only overstriking for bold-italic characters.  Ignored if -c isn't used.

       -c     Use  grotty's  old  output  format  (see  above).  This also disables color output.
              (Debian-specific: This option is enabled by default when using  the  man  and  mdoc
              macro   packages.    It   can   be  disabled  by  default  permanently  by  editing
              /etc/groff/man.local and  /etc/groff/mdoc.local,  or  temporarily  by  setting  the
              GROFF_SGR environment variable to something non-empty.)

       -d     Ignore all \D commands.  Without this grotty renders \D'l...' commands that have at
              least one zero argument (and so are either horizontal or vertical) using -, |,  and
              +  characters.   In  a  similar way, grotty handles \D'p...' commands which consist
              entirely of horizontal and vertical lines.

       -f     Use form feeds in the output.  A form feed is output at the end of each  page  that
              has no output on its last line.

       -Fdir  Prepend  directory  dir/devname  to the search path for font and device description
              files; name is the name of the device, usually ascii, latin1, utf8, or cp1047.

       -h     Use horizontal tabs in the output.  Tabs are assumed to be set every 8 columns.

       -i     Use escape sequences to set the italic text  attribute  instead  of  the  underline
              attribute  for  italic  fonts  (‘I’ and ‘BI’).  Note that most terminals (including
              xterm) don't support this.  Ignored if -c is active.

       -o     Suppress overstriking (other than for bold or underlined characters in case the old
              output format has been activated with -c).

       -r     Use  escape  sequences  to  set the reverse text attribute instead of the underline
              attribute for italic fonts (‘I’ and ‘BI’).  Ignored if -c is active.

       -u     Suppress the use of underlining for italic characters.  Ignored if -c isn't used.

       -U     Use only underlining for bold-italic characters.  Ignored if -c isn't used.

       -v     Print the version number.

USAGE

       grotty understands a single X command produced using the \X escape sequence.

       \X'tty: sgr n'
              If n is non-zero or missing, enable SGR output (this is the default), otherwise use
              the old drawing scheme for bold and underline.

ENVIRONMENT

       GROFF_NO_SGR
              If  set,  the  old  drawing  scheme  for  bold  and  underline (using the backspace
              character) is active.  Colors are disabled.

       GROFF_FONT_PATH
              A list of directories in which to search for the devname directory in  addition  to
              the default ones.  See troff(1) and groff_font(5) for more details.

FILES

       /usr/share/groff/1.22.4/font/devascii/DESC
              Device description file for the ascii device.

       /usr/share/groff/1.22.4/font/devascii/F
              Font description file for font F of the ascii device.

       /usr/share/groff/1.22.4/font/devlatin1/DESC
              Device description file for the latin1 device.

       /usr/share/groff/1.22.4/font/devlatin1/F
              Font description file for font F of the latin1 device.

       /usr/share/groff/1.22.4/font/devutf8/DESC
              Device description file for the utf8 device.

       /usr/share/groff/1.22.4/font/devutf8/F
              Font description file for font F of the utf8 device.

       /usr/share/groff/1.22.4/font/devcp1047/DESC
              Device description file for the cp1047 device.

       /usr/share/groff/1.22.4/font/devcp1047/F
              Font description file for font F of the cp1047 device.

       /usr/share/groff/1.22.4/tmac/tty.tmac
              Macros for use with grotty.

       /usr/share/groff/1.22.4/tmac/tty-char.tmac
              Additional character definitions for use with grotty.

       Note that on EBCDIC hosts, only files for the cp1047 device is installed.

BUGS

       grotty is intended only for simple documents.

       There is no support for fractional horizontal or vertical motions.

       There is no support for \D commands other than horizontal and vertical lines.

       Characters above the first line (i.e. with a vertical position of 0) cannot be printed.

       Color  handling  differs  from grops(1).  \M doesn't set the fill color for closed graphic
       objects (which grotty doesn't support anyway) but changes  the  background  color  of  the
       character cell, affecting all subsequent operations.

SEE ALSO

       groff(1),  troff(1),  groff_out(5),  groff_font(5), groff_char(7), ul(1), more(1), man(1),
       less(1)