groff_font
Groff font file format description
TLDR
List available fonts
$ groff -Tps -Z -f[fontname] < /dev/null
View font directory$ ls /usr/share/groff/current/font/
Check font files$ cat /usr/share/groff/current/font/devps/DESC
DESCRIPTION
groff_font describes the format of font files used by GNU troff (groff). Font files define character metrics, kerning pairs, and other typographic information needed for text layout.Font files are stored in device-specific subdirectories under /usr/share/groff/. Each output device (ps, pdf, html) has its own font definitions with the DESC file specifying device parameters.
FONT FILE FORMAT
$ name fontname
spacewidth n
slant n
ligatures ...
charset
char width type code
...
spacewidth n
slant n
ligatures ...
charset
char width type code
...
FONT DIRECTORIES
$ /usr/share/groff/current/font/devps/ PostScript fonts
/usr/share/groff/current/font/devpdf/ PDF fonts
/usr/share/groff/current/font/devutf8/ UTF-8 terminal
/usr/share/groff/current/font/devhtml/ HTML output
/usr/share/groff/current/font/devpdf/ PDF fonts
/usr/share/groff/current/font/devutf8/ UTF-8 terminal
/usr/share/groff/current/font/devhtml/ HTML output
STANDARD FONTS
$ R - Roman (Times)
I - Italic
B - Bold
BI - Bold Italic
CR - Courier Roman
H - Helvetica
I - Italic
B - Bold
BI - Bold Italic
CR - Courier Roman
H - Helvetica
CAVEATS
Font availability depends on device. Custom fonts need proper installation. PostScript fonts require AFM files. Modern use may prefer pdfgroff.