What’s the simplest way to get an environment variable from a docker container that has not been declared in the Dockerfile?
For instance, an environment variable that has been set through some docker exec container /bin/bash session?
I can do docker exec container env | grep ENV_VAR, but I would prefer something that just returns the value.
I’ve tried using docker exec container echo "$ENV_VAR", but the substitution seems to happen outside of the container, so I don’t get the env var from the container, but rather the env var from my own computer.
Thanks.
