March 2012
Beginner to intermediate
230 pages
7h 27m
English
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Name
telnet — stdin stdout - file -- opt --help --version
Synopsis
telnet [options]host[port]
The telnet program logs you
into a remote machine where you already have an account.
$ telnet remote.example.com
Avoid telnet for remote
logins: most implementations are insecure and send your password
over the network in plain text for anyone to steal. Use ssh instead, which protects your password
and data via encryption. There are two exceptions:
In a Kerberos environment, using enhanced (“kerberized”) telnet software on both the client and server side. See http://web.mit.edu/kerberos/ for more information.
Connecting to a remote port when you aren’t sending any sensitive information at all. For example, to check for the presence of a web server (port 80) on a remote system:
$ telnet remote.example.com 80 Trying 192.168.55.21... Connected to remote.example.com (192.168.55.21). Escape character is '^]'.
xxxType some junk and press Enter <HTML><HEAD> Yep, it’s a web server <TITLE>400 Bad Request</TITLE> </HEAD><BODY> <H1>Bad Request</H1> Your browser sent a request that this server could not understand.<P> </BODY></HTML> Connection closed by foreign host.
To discourage you further from using telnet, we aren’t even going to describe
its options.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.