Docker env. Synonyms for variables in env file?

  docker, environment

Let suppose I have an env file with

DB_PW=123

And a docker command that expects

-env MYSQL_ROOT_PASSWORD=123

Is there a way to take that DB_PW from the env file and assign it to MYSL_ROOT_PASSWORD in the command line? (obviously not having to add a line to the env file with the explicit assignment)
I have been reading here and there, but I am not sure if it’s possible or where this would be documented.

Source: Docker Questions

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