From: Paul Lutus <nospam@...>
Date: 2006-11-28T03:40:08+09:00
Subject: Re: telnet terminal issue

Alex Ciarlillo wrote:

> Okay I am playing around with ruby and its telnet functionality and I
> ran into an interesting problem. I am trying to pull up a report from a
> telnet based program via ruby and I can navigate all the menus and enter
> the date and times for the report I want but as soon as it would usually
> pull up the report to the screen I receive this:
> 
> WARNING: terminal cannot clear to end of line
> WARNING: terminal cannot clear screen
> WARNING: terminal cannot home cursor
> WARNING: terminal cannot move cursor to lower left of screen
> WARNING: terminal cannot scroll backwards

The full Telnet protocol consists of hundreds of properties that the local
machine may or may not be able to support. If the local Telnet session
reports that it supports a property, such as the ability to clear the
screen, and then balks at a subsequent command to do so, the sort of
message you are getting is the result.

Perhaps the server requires the functionality that it is reporting on, and
cannot function at all without it. If that is the case, the specific site
you visited may not work out.

Many Telnet servers don't care about the more advanced features, but some
require them. The local Telnet client session may not be able to find out
whether the require property exists (because it cannot query the console
you are using), or it may not be forwarding it correctly, or some third
possibility.

-- 
Paul Lutus
http://www.arachnoid.com