SED and AWK

Two of the most criminally under-appreciated Linux utilities are Sed and Awk. Although admittedly they can seem a bit arcane, if you ever have to make repetitive changes to large pieces of code or text, or if you ever have to analyze some text, Sed and Awk are invaluable.

SED

The name stands for 'Stream Editor'. It works by reading text, line-by-line into a buffer. For EACH line it will perform the predefined instructions where applicable.

SED is great for log files, config files and other text files and is used for text manipulation for For example