info gawk

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 Time Functions		Functions for dealing with timestamps.
9.1.6 Bit-Manipulation Functions		Functions for bitwise operations.
9.1.7 Getting Type Information		Functions for type information.
9.1.8 String-Translation Functions		Functions for string translation.