am 29. Januar 2000
This is my favorite book on Unix tools. It is written in a readable style, but it is not easy. The exercises really challenge your understanding. You will be pushed to develop more than just a mediocre grasp. The grep exercise is a good example.
It does not stand on its own because of its age and the older tools that are used. ed is a good example. The book uses ed as its text editor and even has a chapter on ed. I have never met an ed user. It would be easy to conclude that there is no reason to bother with ed. But because the Unix system evolved around ed, learning ed syntax is directly applicable to vi, sed, and perl.