$ sbx ports m101-demo --publish 8080/tcp
Published 127.0.0.1:<port> -> 8080/tcp
Published [::1]:<port> -> 8080/tcp
[exit 0]

$ sbx ports m101-demo --json
[
  {
    "host_ip": "127.0.0.1",
    "host_port": 18081,
    "sandbox_port": 8080,
    "protocol": "tcp4"
  },
  {
    "host_ip": "127.0.0.1",
    "host_port": "<port>",
    "sandbox_port": 8080,
    "protocol": "tcp"
  },
  {
    "host_ip": "::1",
    "host_port": "<port>",
    "sandbox_port": 8080,
    "protocol": "tcp"
  }
]
[exit 0]