xlsfonts lists the currently loaded fonts.
bash> xlsfonts
...
-adobe-courier-bold-o-normal--0-0-75-75-m-0-iso8859-1
...
-adobe-new century schoolbook-medium-i-normal--12-120-75-75-p-70-iso8859-14
...
-urw-nimbus roman no9 l-medium-i-normal--0-0-0-0-p-0-iso10646-1
...
X identifies fonts by a hyphen-separated string.
- Foundry
- Font Publisher
- Family
- General Font Identification
- Weight
- bold/medium/...
- Slant
- roman/italic/...
- ...
- Pixelsize
- Bitarray Dimensions
- Pointsize
- Linear Dimensions
- ...
- XResolution-YResolution
- Aspect Ratio - Pixels/Inch
- ...
- Registry-Encoding
- Publisher and Identification