Create desktop icon for AppImage files

Why? Because it gets difficult to differentiate between open apps when all have the same cog icon.

I will use FreeCAD as an example program here. On my system I have a folder at ~/Applications where i keep all the AppImage files. The icons for all the executable are kept in ~/Applications/icons.

• Create a .desktop file under ~/.local/share/applications/ for user or ~/.local/share/applications/ for system
• Download an icon (SVG files work fine)
• The Exec and Icon path values can be anywhere on the system, but you need to provide an absolute path
• Exec path should be an executable file, i.e. chmod +x the file
• Validate the file with desktop-file-validate ~/.local/share/applications/freecad.desktop
• Update the database with update-desktop-database ~/.local/share/applications/

1touch ~/.local/share/applications/freecad.desktop

1[Desktop Entry]
2Type=Application
3Name=FreeCAD
4Comment=An open source parametric 3D CAD modeler
5Icon=/home/amna/Applications/icons/FreeCAD.svg
6Exec=/home/amna/Applications/FreeCAD.AppImage
7Categories=Graphics;Engineering

1# provide the path for .desktop file
2desktop-file-validate ~/.local/share/applications/freecad.desktop

1# provide the path for the entire directory, not the file
2update-desktop-database ~/.local/share/applications/