File: gawk.info,  Node: Built-in,  Next: User-defined,  Up: Functions

9.1 Built-in Functions
======================

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

* Menu:

* Calling Built-in::            How to call built-in functions.
* Boolean Functions::           A function that returns Boolean values.
* Numeric Functions::           Functions that work with numbers, including
                                'int()', 'sin()' and 'rand()'.
* String Functions::            Functions for string manipulation, such as
                                'split()', 'match()' and
                                'sprintf()'.
* I/O Functions::               Functions for files and shell commands.
* Time Functions::              Functions for dealing with timestamps.
* Bitwise Functions::           Functions for bitwise operations.
* Type Functions::              Functions for type information.
* I18N Functions::              Functions for string translation.