I landed myself in a shop that sells, essentially, tiny locally-networked systems of specialized Linux boxes. Yes, our core offering is running on the JVM, but all along the edges there is just so much Bash and PHP.
I don't think I'll ever work in a place again where I have this much opportunity to become a genuine old school shell and webshell wizard again. I want to master the Primordial Arts, their endless exceptions to exceptions, and come out the other side as a true master of something completely fucking ridiculous.
I did it once with Microsoft PowerShell. I can do it again.