The remote host may still ask explicitly for variables that are not exported. Prints out help information for the environ com mand. This command is similar to a close command. But if it does, this command should cause it to close the connection. If the remote side also supports the concept of suspending a user's session for later reattachment, the logout command in dicates that the session should be terminated immediately.
Type is one of several options, depending on the state of the session.
Telnet asks the remote host to go into the requested mode. If the remote host says it can, that mode takes effect. Protocol negotiation can be forced by placing a dash before the port number. After establishing a connection, any commands associated with the remote host in the user's .telnetrc file are executed. The rest of the file should consist of hostnames and sequences of telnet com mands to use with that host.