Self-learning Linux Shell19.2-gawk program advanced features

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19.2-gawk Program Advanced Features

The two most widely used command line editors in the Linux world:

• Sed
• Gawk

1. Gawk Using variables

A common feature of programming languages is the use of variables to access values. The Gawk programming language supports two different types of variables:

• Built-in variables
• Custom variables

1.1 Built-in variables

The Gawk program uses built-in variables to refer to some of the special features in the program data.

Variable	Describe
FieldWidths	A column of numbers separated by spaces that defines the exact width of each data field
Fs	Enter Field delimiter
Rs	Enter data row delimiter
OFS	Output field delimiter
ORS	Output data row delimiter

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Self-learning Linux Shell19.2-gawk program advanced features