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A guide on using porter run can be found here.
Prerequisites

porter run

The porter run command allows users to execute a command on a remote container:
porter run [APP_NAME] -- [COMMAND] [args...]

The APP_NAME is the name of the application on the Porter dashboard (this can be a release either in the “Applications” or the “Jobs” tab).

porter run cleanup

It can also cleanup residual instances of applications that may have been left behind as a result of a previous call to porter run:
porter run cleanup

You may learn more about ephemeral instances in the Ephemeral Instances section.