Hi there,

After set a variable by `set $name value`, i can reference it like `$name`,
but when i export a OS Environment Variale by `env name_from_env`, like http://wiki.nginx.org/CoreModule#env said,
and i am sure the name_from_env is valid which defined form nginx's parent process.

But, my friends, how to reference it ?
$name_from_env or ${name_from_env} or %name_from_env% didn't work what i've tried before.

Thanks a lot.