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--- awk:introduction_to_awk [2020/05/06 19:12] – peter
+++ awk:introduction_to_awk [2021/01/06 15:16] (current) – removed peter
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-====== AWK - Introduction to AWK ======
-**AWK** is a programming-language tool used to manipulate text.
-It allows you to create short programs that read input files, sort data, process it, perform arithmetic on the input, and generate reports, among myriad other functions.
-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.
-The general syntax for the command is:
-<code bash>
-awk '{pattern + action}' {filenames}
-</code>
-...where pattern represents what AWK is looking for in the data, and action is a series of commands executed when a match is found.
-<WRAP info>
-**NOTE:**  Curly brackets ({}) are not always required around your program, but they are used to group a series of instructions based on a specific pattern.
-</WRAP>
-----
-===== AWK Workflow =====
-AWK follows a simple workflow − Read, Execute, and Repeat.
-{{:awk:awk_-_workflow.png?600|}}
-  * **Read** - AWK reads a line from the input stream (file, pipe, or stdin) and stores it in memory.
-  * **Execute** - All AWK commands are applied sequentially on the input. By default AWK execute commands on every line. We can restrict this by providing patterns.
-  * **Repeat** - This process repeats until the file reaches its end.