import subprocess


def run_cmd(command):
    process = subprocess.Popen(command.split(),
                               stdout=subprocess.PIPE,
                               stderr=subprocess.STDOUT,
                               universal_newlines=True,
                               )
    return '\n'.join([str(line) for line in iter(process.stdout.readline, '')])


def print_cmd(command):
    for line in run_cmd(command):
        print(line, end='')


if __name__ == "__main__":
    print_cmd("env")