From Linux Man Pages
grotty - groff driver for typewriter-like devices
SYNOPSIS
grotty [ -bBcdfhiouUv ] [ -Fdir ] [ files... ]
It is possible to have whitespace between the -F option and its parameter.
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, -Tascii8, -Tlatin1, -Tnippon or -Tutf8 option on
ASCII based systems, and with -Tcp1047 and -Tutf8 on EBCDIC based hosts. If no files are given, grotty will read
the standard input. A filename of - will also cause 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 col-
ors; 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).
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.
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 pip-
ing 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 will be treated as an italic font; if the
02 bit is set, then it will be treated as a bold font. The code field in the font description field gives the
code which will be used to output the character. This code can also be used in the \N escape sequence in troff.
OPTIONS
-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.
-d Ignore all \D commands. Without this grotty will render \D'l...' commands that have at least one zero
argument (and so are either horizontal or vertical) using -, |, and + characters.
-f Use form feeds in the output. A form feed will be 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, ascii8, latin1, utf8, nippon 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).
-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.
FILES
/usr/share/groff/1.18.1/font/devascii/DESC
Device description file for ascii device.
/usr/share/groff/1.18.1/font/devascii/F
Font description file for font F of ascii device.
/usr/share/groff/1.18.1/font/devascii8/DESC
Device description file for ascii8 device.
/usr/share/groff/1.18.1/font/devlatin1/DESC
Device description file for latin1 device.
/usr/share/groff/1.18.1/font/devnippon/DESC
Device description file for nippon device.
/usr/share/groff/1.18.1/font/devlatin1/F
Font description file for font F of latin1 device.
/usr/share/groff/1.18.1/font/devutf8/DESC
Device description file for utf8 device.
/usr/share/groff/1.18.1/font/devutf8/F
Font description file for font F of utf8 device.
/usr/share/groff/1.18.1/font/devcp1047/DESC
Device description file for cp1047 device.
/usr/share/groff/1.18.1/font/devcp1047/F
Font description file for font F of cp1047 device.
/usr/share/groff/1.18.1/tmac/tty.tmac
Macros for use with grotty.
/usr/share/groff/1.18.1/tmac/tty-char.tmac
Additional klugdey character definitions for use with grotty.
Note that on EBCDIC hosts, only files for the cp1047 device will be 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 (ie with a vertical position of 0) cannot be printed.
Color handling is different compared to 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 sub-
sequent operations.
RELATED
groff(1), troff(1), groff_out(5), groff_font(5), groff_char(7), ul(1), more(1), man(1), less(1)
CATEGORY