[asicsp]

I have ebooks on GNU sed and GNU awk with plenty of examples and exercises (free to read online):

* https://learnbyexample.github.io/learn_gnused/

* https://learnbyexample.github.io/learn_gnuawk/

I also wrote TUI apps for interactive exercises (grep, sed, awk, etc): https://github.com/learnbyexample/TUI-apps