Robots.txt Allow sub folder but not the parent

Question

Can anybody please explain the correct robots.txt command for the following scenario.

I would like to allow access to:

/directory/subdirec

Answer 1

I would recommend using Google's robot tester. Utilize Google Webmaster tools - https://support.google.com/webmasters/answer/6062598?hl=en

You can edit and test URLs right in the tool, plus you get a wealth of other tools as well.