Exercism…  

I just want to take a moment to plug exercism.io - anyone who is looking to get help learning a programming language or extending their current knowledge should use this site as a resource. They provide ‘practice problems’ you can work through to hone your skills.

 
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Now read this

Managing local password policy with `pwpolicy`

Have you ever wanted to enforce password policies on local OS X users? Things like complexity, expiration, rotation, etc? Well you are in luck! On OS X, users are managed in a local Directory Service, and so you have the same tools on... Continue →