awk
The awk language provides a number of predefined, or built-in variables, which
your programs can use to get information from awk. There are other
variables your program can set to control how awk processes your
data.
In addition, awk provides a number of built-in functions for doing
common computational and string related operations.
As we develop our presentation of the awk language, we introduce
most of the variables and many of the functions. They are defined
systematically in section Built-in Variables, and
section Built-in Functions.
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