Execute a Digital Ocean API PUT request:

doex put <path> <attributes>

For example:

mix doex.put /images/12345 --name newname

The output will be similar to the following, and it's the IDs you want:

{:ok,
 %{"image" => %{"created_at" => "2017-08-02T13:54:05Z",
     "distribution" => "Ubuntu", "id" => 12345, "min_disk_size" => 20,
     "name" => "newname", "public" => false,
     "regions" => ["tor1"], "size_gigabytes" => 2.05, "slug" => nil,
     "type" => "snapshot"}}}