How to clear the icon cache in bash?

[framp]

I want to refresh an icon used in a desktop file in my raspiBackup installer written in bash. The OS is RaspbianOS which uses LXDE.
Unfortunately the icon displayed on the desktop doesn't change when the icon is updated. If I restart the OS the updated icon is displayed. I searched in the net how I can refresh the icon cache on LXDE but unfortunately didn't find any hint. Would be great if I get a pointer or even the command I can use to clear the icon cache .