Thanks Mike, you're very kind.

I too have used sed for many years, but I always ignored much of the weird and wonderful stuff it's capable of and made do with the 's' command and a few others like 'd' and 'q', as well as line addressing. In doing this series, I'm at last learning how to do some more sophisticated things with sed, so it's fun to do.

Episode 4 is finished and waiting to be posted, and episode 5 (the really deeply weird stuff) is in production. I'm trying to explain some of the examples in the GNU sed manual in 5, but I'll have to understand them myself first!

Yes, I'd quite like to do a series on awk, and will if I can.