This post shows how to figure out what runs when you click on the "Xilinx SDK 2017.4" in Ubuntu 16.04.2.
To figure out what happens when you click here:
1. Change to your home directory
2. Change to the directory that holds the .desktop files
3. Open Xilinx SDK 2017.4_1521588724262.desktop
5. If you run xsdk the SDK will boot as if you clicked on it.
6. xsdk also accepts these command line options: