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I don't find %f, %F, %u, %U in bash manual.

In /usr/share/applications/gedit.desktop, I also see similar usage:

[Desktop Entry]
Name=gedit
GenericName=Text Editor
Comment=Edit text files
Exec=gedit %U

Do %f, %F, %u, %U belong to bash?

If not, what uses them?

5

No, they are provided by the software that created the window.

  • Thanks. What, if not bash, uses them? – Tim Jun 14 '17 at 21:56
  • 6
    The software that created the window. – DopeGhoti Jun 14 '17 at 22:00
0

Have a look at Recognized Desktop Entry Keys of FreeDesktop.

Specifically have a look at the Exec Key.
In your case $U means it should handle the input which comes after the call to the program as URL Address.

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