Awk Explained

Awk is a Unix tool that can be very useful for dealing with text but can be hard to understand. Here are some useful explanations. 
 
 awk is a beautiful tool 	 Famous Awk One-Liners Explained, Part I 	 8 Powerful Awk Built-in Variables – FS, OFS , RS, ORS , NR, NF, FILENAME , FNR 	 How to use awk command in Linux 	 
 Handy One-Line Scripts for Awk – Eric Pement