grotty - groff driver for typewriter-like devices
] [ -Fdir
] [ files
It is possible to have whitespace between the -F
option and its
translates the output of GNU troff
into a form suitable for
typewriter-like devices. Normally grotty
should be invoked by using the
command with a -Tascii
option on ASCII based systems, and with -Tcp1047
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
(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
with the sequence `c BACKSPACE
' and an italic character c
by the sequence `_
'. At the same time, color output is
disabled. The same effect can be achieved by setting either the
environment variable or using the `sgr' X command (see
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.
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
environment variable instead.
's old output format can be displayed on a terminal by piping
. Pagers such as more(1)
able to display these sequences. Use either -B
; use -b
when piping into more(1)
. There is
no need to filter the output through col(1)
outputs reverse line feeds.
The font description file may contain a command
- internalname 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
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
man page for more details.
- Suppress the use of overstriking for bold characters. Ignored if -c
- Use only overstriking for bold-italic characters. Ignored if -c
- Use grotty's old output format (see above). This also disables
- 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.
- 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.
- 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.
- Use horizontal tabs in the output. Tabs are assumed to be set every 8
- 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
- Suppress overstriking (other than for bold or underlined characters in
case the old output format has been activated with -c).
- Use escape sequences to set the reverse text attribute instead of the
underline attribute for italic fonts (`I' and `BI'). Ignored if -c
- Suppress the use of underlining for italic characters. Ignored if
-c isn't used.
- Use only underlining for bold-italic characters. Ignored if -c
- Print the version number.
understands a single X command produced using the \X
- \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
- If set, the old drawing scheme for bold and underline (using the backspace
character) is active. Colors are disabled.
- 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.
- Device description file for ascii device.
- Font description file for font F of ascii device.
- Device description file for latin1 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 is installed.
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
Characters above the first line (ie with a vertical position of 0) cannot
Color handling is different compared to grops(1)
the fill color for closed graphic objects (which grotty
anyway) but changes the background color of the character cell, affecting all