~$ az extension add --name image-copy-extension
 
~$ ls -1 -F ~/.azure/cliextensions/image-copy-extension/
azext_imagecopy/
image_copy_extension-0.2.3-py2.py3-none-any.whl
image_copy_extension-0.2.3.dist-info/
 
~$ az image copy
az image copy: error: the following arguments are required: --source-resource-group, --source-object-name, --target-location, --target-resource-group
