DESCRIPTION

       The following environment variables describe a TCP connection.  They
       are set up by tcp-env, tcpclient, and tcpserver.  Note that
       TCPLOCALHOST, TCPREMOTEHOST, and TCPREMOTEINFO can contain arbitrary
       characters.

       PROTO
            The string TCP or TCP6.

       TCPLOCALHOST
            The domain name of the local host, with uppercase letters
            converted to lowercase.  If there is no currently available domain
            name for the local IP address, TCPLOCALHOST is not set.

       TCPLOCALIP
            The IPv4 address of the local host, in dotted-decimal form or the
            respective compactified IPv6 address.

       TCPLOCALPORT
            The local TCP port number, in decimal.

       TCPREMOTEHOST
            The domain name of the remote host, with uppercase letters
            converted to lowercase.  If there is no currently available domain
            name for the remote IP address, TCPREMOTEHOST is not set.

       TCPREMOTEINFO
            A connection-specific string, perhaps a username, supplied by the
            remote host via 931/1413/IDENT/TAP.  If the remote host did not
            supply connection information, TCPREMOTEINFO is not set.

       TCPREMOTEIP
            The IPv4 or compactified IPv6 address of the remote host.

       TCPREMOTEPORT
            The remote TCP port number.

       TCP6INTERFACE
            The interface name ("eth0") for IPv6 connections using link-local
            addresses.

       TCP6REMOTEIP
            The compactified or IPv4-mapped IPv6 address of the remote host.

       TCP6REMOTEHOST
            Identical to TCPREMOTEHOST.

       TCP6REMOTEPORT
            Identical to TCPREMOTEPORT.


SEE ALSO

       tcpclient(1), tcpserver(1), tcp-env(1), tcp(4)

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