AWK: The Linux Administrators’ Wisdom Kit

“To put it the simplest way possible, AWK is a
programming-language tool used to manipulate text. The language of
the AWK utility resembles the shell-programming language in many
areas, although AWK’s syntax is very much its own. When first
created, AWK was designed to work in the text-processing arena, and
the language is based on executing a series of instructions
whenever a pattern is matched in the input data. The utility scans
each line of a file, looking for patterns that match those given on
the command line. If a match is found, it takes the next
programming step. If no match is found, it then proceeds to the
next line.

“While the operations can get complex, the syntax for the
command is always:

“awk ‘{pattern + action}’ {filenames}

“where pattern represents what AWK is looking for in the data,
and action is a series of commands executed when a match is found.
Curly brackets ({}) are not always required around your program,
but they are used to group a series of instructions based on a
specific pattern.”

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