Install the package
In general, type these commands with
bash-completion, and you’ll see the right option.
Ask what type of application opens an mkv file:
xdg-mime query default video/mkv
Same with pdf:
xdg-mime query default application/pdf
Ask what file-type
xdg-mime query filetype book.pdf
Set the mime type of mp4 videos to mpv.
xdg-mime default mpv.desktop video/mp4
You’ll need to use the tab key a lot here, and remember many items start with
You can use an asterisk for everything in a category.
xdg-mime default org.gnome.font-viewer.desktop font/*
This often won’t work as expected, because some fonts will have the type
application rather than