Get Environment Variable from Docker Container

Question

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 v

Answer 1

One more since we are dealing with json

docker inspect  | jq '.[] | .Config.Env'

Output sample

[
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
  "NGINX_VERSION=1.19.4",
  "NJS_VERSION=0.4.4",
  "PKG_RELEASE=1~buster"
]