(gawk.info)Built-in

Built-in Functions
******************

   "Built-in" functions are functions that are always available for
your `awk' program to call.  This chapter defines all the built-in
functions in `awk'; some of them are mentioned in other sections, but
they are summarized here for your convenience.  (You can also define
new functions yourself.  Note: User-defined Functions.)



* Calling Built-in
How to call built-in functions.
* 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 time stamps.