Generating all xdg-mime commands

This generates the xdg-mime commands for each .desktop files and all mimetypes they contain:

find /usr/share/applications ~/.local/share/applications \
  -iname '*.desktop' -print0 | while IFS= read -r -d $'\0' d; do
    for m in $(grep MimeType "$d" | cut -d= -f2 | tr ";" " "); do
        echo xdg-mime default "'${d##/*/}'" "'$m'"
    done
done

Suggested on https://unix.stackexchange.com/a/361705

For example to generate commands that make

• zathura
• geeqie
• nvim
• mpv
• onlyoffice-desktopeditors
• vifm
• qutebrowser
• cr3

preferred applications, run

for p in cr3 qutebrowser vifm onlyoffice-desktopeditors mpv nvim geeqie zathura; do
  grep "$p" fl | grep -v "zathura-pdf-poppler"
done

where fl is the file obtained via the above command. Note that the order of applications in the cycle is reversed.