Weirdly, perl. I found myself on a client site in a locked down environment with only the Windows version of GIT installed. Powershell disabled, no other programs allowed. I had to produce reports on the log files for this machine, but had to obfuscate information before taking it off the server.
I discovered that git had bash installed quite early on, so my initial automation and reporting was based on UNIX pipelines. As the data volumes became bigger and the customer requirements became more demanding, I eventually bit the bullet and started learning perl one-liners to do some gymnastics that just weren't possible or practical with just bash (first big win was adding the MD5 of the line so that I could dedupe the obfuscated data).
This lead to eventually writing full scripts in perl and now I have basically all of my reporting automated, even able to take up some 'value add' reporting that I didn't think was going to be possible.
So yeah, not a new technology but I'm now a perl convert and will almost certainly use it in the future if I'm faced with a similar situation.