print env file
docker run -it -e TEST=abc alpine printenv
docker run -it --env-file env.list alpine printenv
docker exec container bash -c 'echo "$ENV_VAR"'
To list all environment variables
printenv
To print a specific environment variable
echo $Env_Var_Name
echo $PATH
To view all env variables:
docker exec container env
To get one:
docker exec container env | grep VARIABLE | cut -d'=' -f2