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S4 Class representing an EXPOSE-instruction
(character or numeric, required) the port of the container to be exposed
(numeric, optional) port of the host, if missing the same port as in the container is exposed
object
Other instruction classes: Add-class, Arg-class, Cmd-class, Comment-class, Copy-class, Entrypoint-class, Env-class, From-class, Healthcheck-class, Instruction-class, Label-class, Maintainer-class, Onbuild-class, Run-class, Run_shell-class, Shell-class, Stopsignal-class, Volume-class, Workdir-class
Add-class
Arg-class
Cmd-class
Comment-class
Copy-class
Entrypoint-class
Env-class
From-class
Healthcheck-class
Instruction-class
Label-class
Maintainer-class
Onbuild-class
Run-class
Run_shell-class
Shell-class
Stopsignal-class
Volume-class
Workdir-class
# NOT RUN { #no example yet # }
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