docker-docs/compose/reference/port.md

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Prints the public port for a port binding.s	fig, composition, compose, docker, orchestration, cli, port	main identifier parent port.compose smn_compose_cli	port

port

Usage: port [options] SERVICE PRIVATE_PORT

Options:
--protocol=proto  tcp or udp [default: tcp]
--index=index     index of the container if there are multiple
                  instances of a service [default: 1]

Prints the public port for a port binding.