GNU Info

(gawk.info)Special Files

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Special File Names in `gawk'
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   `gawk' provides a number of special file names that it interprets
internally.  These file names provide access to standard file
descriptors, process-related information, and TCP/IP networking.

Special FD

Special files for I/O.

Special Process

Special files for process information.

Special Network

Special files for network communications.

Special Caveats

Things to watch out for.