%u

What does "%U" mean when calling a command?

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https://askubuntu.com/questions/30210/what-does-u-mean-when-calling-a-command

used at the end of the command entries for some Gnome menu entries

%u - a parameter for the Exec key in .desktop files - Local files may either be passed as file: URLs or as file path

%U - list of URLs

%f - file uri?

%F - file uri list?

So, e.g., /usr/share/applications/gedit.desktop contains:

Exec=gedit %U

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