A copy:

http://gen.lib.rus.ec/book/index.php?md5=0AD0779BF3602F1EA22...

Also Arnold Robbins' books Sed and Awk and Effective Awk Programming are excellent, and also detail the many features added since the latest edition of The AWK Programming Language (1988).

http://gen.lib.rus.ec/search.php?&req=awk+robbins&sort=year&...