gawk: Functions

 
 9 Functions
 ***********
 
 This major node describes 'awk''s built-in functions, which fall into
 three categories: numeric, string, and I/O. 'gawk' provides additional
 groups of functions to work with values that represent time, do bit
 manipulation, sort arrays, provide type information, and
 internationalize and localize programs.
 
    Besides the built-in functions, 'awk' has provisions for writing new
 functions that the rest of a program can use.  The second half of this
 major node describes these "user-defined" functions.  Finally, we
 explore indirect function calls, a 'gawk'-specific extension that lets
 you determine at runtime what function is to be called.
 

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