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This is useful mainly for knowing if the current copy of gawk on your system is up to date with respect to whatever the Free Software Foundation is distributing. (Per the GNU Coding Standards, these options cause an immediate, successful exit.) Gawk first reads the program source from the program-file(s) if specified, from arguments to --source, or from the first non-option argument on the command line.The -f and --source options may be used multiple times on the command line.If there are no files named on the command line, gawk reads the standard input.
Gawk reads the program text as if all the program-files and command line source texts had been concatenated together.
This is useful for building libraries of program that uses them.
If this variable does not exist, the default path is ".:/usr/local/share/awk".
(The actual directory may vary, depending upon how gawk was built and installed.) If a file name given to the -f option contains a "/" character, no path search is performed. First, all variable assignments specified via the -v option are performed.
It also provides the ability to mix library functions with command line programs.
The environment variable AWKPATH specifies a search path to use when finding source files named with the -f option.
It is also useful for controlling state if multiple passes are needed over a single data file.
If the value of a particular element of ARGV is empty (""), gawk skips over it.
also has one dimensional arrays; arrays with multiple dimensions may be simulated.
Several pre-defined variables are set as a program runs; these are described as needed and summarized below.