How to set the `xdg-mime` default?

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Short xdg-mime tutorial:

  • xdg-mime query filetype <file> to get the mimetype of <file>
  • see available .desktop files in /run/current-system/sw/share/applications (or others from $XDG_DATA_DIRS)
  • use xdg-mime default <programname>.desktop <mimetype> to change the default program, e.g. xdg-mime default firefox.desktop text/plain
  • Mime type for HTTP and HTTPS is x-scheme-handler/http and x-scheme-handler/https

The reason your command doesn’t work is because the evince .desktop file was renamed to org.gnome.Evince.desktop, so this command should work:

xdg-mime default org.gnome.Evince.desktop application/pdf
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