Say what you will about the depth of this book. I am here to tell you that on more than one occasion this book has saved my bacon. Several times in different environments I needed to use sed to correct data in flat files. Once I used sed to change the format and numbers when we wanted to match accounting numbers to a different system. I haven't used that much awk. However there has been occasion to transfer awk programs from one Unix to a different Unix flavor. I found that the regular awk in this book was newer than the newawk in the other system. I Still keep the book handy incase I get squeezed for time and have to manipulate files. However I am learning more and more to appreciate PERL on those occasions.