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The GNU Awk User's Guide

9.1 Built-in Functions

Built-in functions are always available for your awk program to call. This section defines all the built-in functions in awk; some of these are mentioned in other sections but are summarized here for your convenience.

9.1.1 Calling Built-in Functions		How to call built-in functions.
9.1.2 Numeric Functions		Functions that work with numbers, including

                                int, sin and rand.

9.1.3 String-Manipulation Functions

Functions for string manipulation, such as

                                split, match and sprintf.

9.1.4 Input/Output Functions		Functions for files and shell commands.
9.1.5 Using gawk's Timestamp Functions		Functions for dealing with timestamps.
9.1.6 Bit-Manipulation Functions of gawk		Functions for bitwise operations.
9.1.7 Using gawk's String-Translation Functions		Functions for string translation.