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# Step 1: A trivial application
The following is only useful in the desktop system based on [Desktop Entry Specification](https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html) such as GNOME.
To make gnome-shell use the desktop file and icon for this example while running it uninstalled, do the following:
```console
$ mkdir -p ~/.local/share/applications
$ cp org.gtk.exampleapp.desktop ~/.local/share/applications/org.gtk.exampleapp.desktop
$ mkdir -p ~/.local/share/icons/hicolor/48x48/apps
$ cp exampleapp.png ~/.local/share/icons/hicolor/48x48/apps
```
The file exapmleapp.png is from the GTK GitLab repository.
The original file is [here](https://gitlab.gnome.org/GNOME/gtk/-/blob/main/examples/application1/exampleapp.png) and the license is LGPL 2.1 or later.
Note:
1. You need to install your exampleapp.rb in advance.
```console
$ cp exampleapp.rb ~/.local/bin/exampleapp.rb
$ chmod +x ~/.local/bin/exampleapp.rb
```
2. If you use rbenv, your ruby executable may not be found.
You can solve this by creating a symbolic link in `~/.local/bin` to your ruby executable.
For example,
```console
$ ln -s $(rbenv which ruby) ~/.local/bin/ruby
```
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