(gawk.info) Library Functions

 
 A Library of `awk' Functions
 ****************************
 
    This chapter presents a library of useful `awk' functions.  The
 sample programs presented later ( Practical `awk' Programs Sample
 Programs.)  use these functions.  The functions are presented here in a
 progression from simple to complex.
 
     Extracting Programs from Texinfo Source Files Extract Program,
 presents a program that you can use to extract the source code for
 these example library functions and programs from the Texinfo source
 for this Info file.  (This has already been done as part of the `gawk'
 distribution.)
 
    If you have written one or more useful, general purpose `awk'
 functions, and would like to contribute them for a subsequent edition
 of this Info file, please contact the author.   Reporting Problems
 and Bugs Bugs, for information on doing this.  Don't just send code,
 as you will be required to either place your code in the public domain,
 publish it under the GPL ( GNU GENERAL PUBLIC LICENSE Copying.),
 or assign the copyright in it to the Free Software Foundation.

 
* Portability Notes           What to do if you don't have `gawk'.
* Nextfile Function           Two implementations of a `nextfile'
                                 function.
* Assert Function             A function for assertions in `awk'
                                 programs.
* Round Function              A function for rounding if `sprintf' does
                                 not do it correctly.
* Ordinal Functions           Functions for using characters as numbers and
                                 vice versa.
* Join Function               A function to join an array into a string.
* Mktime Function             A function to turn a date into a timestamp.
* Gettimeofday Function       A function to get formatted times.
* Filetrans Function          A function for handling data file transitions.
* Getopt Function             A function for processing command line
                                 arguments.
* Passwd Functions            Functions for getting user information.
* Group Functions             Functions for getting group information.
* Library Names               How to best name private global variables in
                                 library functions.

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