xdg-mime

Query and manage MIME types according to the XDG standard. More information: https://portland.freedesktop.org/doc/xdg-mime.html.

• Display the MIME type of a file:

xdg-mime query filetype path/to/file

• Display the default application for opening PNGs:

xdg-mime query default image/png

• Display the default application for opening a specific file:

xdg-mime query default $(xdg-mime query filetype path/to/file)

• Set imv as the default application for opening PNG and JPEG images:

xdg-mime default imv.desktop image/png image/jpeg