Functions
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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, and to 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.