Starting with version 3.1 of gawk, awk programs
can open a two-way
TCP/IP connection, acting as either a client or a server.
This is done using a special file name of the form:
The protocol is one of `tcp', `udp', or `raw',
and the other fields represent the other essential pieces of information
for making a networking connection.
These file names are used with the `|&' operator for communicating
with a coprocess
(see section Two-Way Communications with Another Process).
This is an advanced feature, mentioned here only for completeness.
Full discussion is delayed until
Using gawk for Network Programming.
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