grotty - Online in the Cloud

PROGRAM:

NAME

grotty - groff driver for typewriter-like devices

SYNOPSIS

grotty [ -bBcdfhioruUv ] [ -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,
-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).

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

-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 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.

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