One of the most crucial tasks before submitting our dear applications to the app store: creating the icons and splash screens that will look nice on the 24000+ possible mobile devices (yep that’s a big number).
We will see in this tutorial how to automatically do this using the Ionic CLI.
I didn’t see you wrote the actual command: ionic resources or did I miss it 
Looks like you searched for the “old” CLI command:
ionic resources
The new CLI now split the commands, many of them now add “cordova”:
ionic cordova build
ionic cordova run
ionic cordova resources
Basically everything that is related to devices.
3 Likes
In my case only
"cordova resources" a worked well to generate icons and splash screen.