Default applications

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To change the default application associated with a filetype you must use the xdg-mime command and point to the desired desktop file (if it doesn't exist, you must create one).

Example

In the following example we want to make mupdf the default command to open pdf files. First you need to create a desktop file, because mupdf doesn't provide one.

$ cat > ~/.local/share/applications/mupdf.desktop

[Desktop Entry]
Type=Application
Terminal=false
Exec=/usr/bin/mupdf-gl
Name=mupdf

Then you must use xdg to associate the desktop file with the pdf extension.

$ xdg-mime default mupdf.desktop application/pdf

That's all.