$ sbx ports m101-demo --unpublish 18081:8080
Unpublish requested for port 18081 -> 8080
[exit 0]

$ sbx ports m101-demo --unpublish <port>:8080/tcp
Unpublish requested for port <port> -> 8080/tcp
[exit 0]

$ sbx ports m101-demo --json
[]
[exit 0]