grotty - groff driver for typewriter-like devices
grotty [ -bBcdfhiouUv ] [ -Fdir ] [ files... ]
It is possible to have whitespace between the -F option and its parameter.
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 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
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 interpre-
tation 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.
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 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
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 char-
acter. This code can also be used in the \N escape sequence in troff.
-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
-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.
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.
If set, the old drawing scheme for bold and underline (using the backspace charac-
ter) is active. Colors are disabled.
Device description file for ascii device.
Font description file for font F of ascii device.
Device description file for ascii8 device.
Device description file for latin1 device.
Device description file for nippon device.
Font description file for font F of latin1 device.
Device description file for utf8 device.
Font description file for font F of utf8 device.
Device description file for cp1047 device.
Font description file for font F of cp1047 device.
Macros for use with grotty.
Additional klugdey character definitions for use with grotty.
Note that on EBCDIC hosts, only files for the cp1047 device will be installed.
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 subsequent operations.
groff(1), troff(1), groff_out(5), groff_font(5), groff_char(7), ul(1), more(1), man(1),
Groff Version 1.18.1 12 February 2003 GROTTY(1)