GNU/Linux Desktop Survival Guide by Graham Williams
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Fonts: TrueType Local Fonts

20201119 Fonts in the form of otf and ttf files can be added to the system either per user into  /.local/share/fonts/ or system wide into /usr/local/share/fonts/. To list all fonts that are known to the system:

$ fc-list -f '%{file}\n' | sort
[...]
/home/kayon/.local/share/fonts/muli/Muli-BlackItalic.ttf
/home/kayon/.local/share/fonts/muli/Muli-Black.ttf
/home/kayon/.local/share/fonts/muli/Muli-BoldItalic.ttf
/home/kayon/.local/share/fonts/muli/Muli-Bold.ttf
[...]

If they are installed system wide:

fc-list -f '%{file}\n' | grep Muli
/usr/local/share/fonts/Muli-Medium.ttf
/usr/local/share/fonts/Muli-Bold.ttf
/usr/local/share/fonts/Muli-BoldItalic.ttf
/usr/local/share/fonts/Muli-MediumItalic.ttf

When adding fonts to /usr/local/share/fonts/ the font cache may need to be refreshed:

$ fc-cache -f -v

The files within the directory can be organised, per font family for example, into separate sub-directories.