tcp-environ - TCP-related environment variables

NAME  DESCRIPTION  SEE ALSO 

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NAME

tcp-environ − TCP-related environment variables

DESCRIPTION

The following environment variables describe a TCP connection. They are set up by tcp-env, tcpclient, and tcpserver. Note that TCP(6)LOCALHOST, TCP(6)REMOTEHOST, and TCP(6)REMOTEINFO 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.

TCPREMOTEIP

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

TCPREMOTEPORT

The remote TCP port number.

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.

TCP6INTERFACE

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

TCP6LOCALIP

The IPv6 address of the local host in compactified IPv6 address.

TCP6REMOTEIP

The compactified IPv6 address of the remote host.

TCP6LOCALPORT

and

TCP6LOCALHOST

as well as

TCP6REMOTEPORT

and

TCP6REMOTEHOST

are identical to their IPv4 counterparts.

SEE ALSO

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

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