tcp-environ − TCP-related environment variables
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.
tcpclient(1), tcpserver(1), tcp-env(1), tcp(4)