The author forgot one: C-like syntax I believe this was intentional by the authors. In the early days of UNIX, I think more of its users knew C. Today, it is

The author forgot one: C-like syntax I believe this was intentional by the authors. In the early days of UNIX, I think more of its users knew C. Today, it is probably a much smaller number. However, learning AWK today, IMO, can help someone who also intends to learn C.