Get docker container environment variables

dockerenv.sh

#!/bin/bash
containerName=$1
echo "containerName: $containerName"
if [ "$containerName" == "" ]; then
    echo "USAGE: $0 containerName"
    echo "  containerName: id or name"
    exit 1
fi

docker inspect -f \
    '{{range $index, $value := .Config.Env}}{{println $value}}{{end}}' \
    $containerName