Special Network (The GNU Awk User’s Guide)
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5.8.2 Special Files for Network Communications
gawk
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:
/net-type/protocol/local-port/remote-host/remote-port
The net-type
is one of ‘inet
’, ‘inet4
’, or ‘inet6
’. The protocol
is one of ‘tcp
’ or ‘udp
’, 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 /@w (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.