Application Analysis of Telnet commands

We do not know much about the Telnet command. In terms of remote control, this command is indispensable. So today we will introduce these commands. Telnet is used for remote logon to the Internet. it allows users to sit on the keyboard of an Internet-connected computer and access the computer of another Internet-connected computer through the network. this connection can happen on a computer in the same room or on a computer that has been connected to the Internet all over the world. traditionally, a computer connected to a computer that provides services to all users on the network is called a server, and a machine in use is called a client ). once connected, the client can enjoy all the services provided by the server. you can run a common interaction process (register and run commands) or access many special servers, such as searching for book indexes. various services provided by different hosts on the Internet can be used.

The simplest way to use the Telnet protocol is to type in the command line:

%telnet remote-computer-name(or IP) 

Here the C shell of UNIX system is used, because the command is set to "% ". if other computer systems (such as OS, VAX/VMS, and Macintosh) commands are used, there are only some differences in details, but they are essentially the same, the following is an example of a basic Telnet command:

telnet porky.math.ukans.edu 
Trying 129.237.128.11... 
Connected to porky.math.ukans.edu. 
Escape character is '^]'. 
SunOS UNIX(porky) 
login:wl 
password:xxxxxxx 
Last Login: Tue Mar 28 05:35 from ns.bta.net.cn 
SunOS Release 4.1.3_U1(SLIPPERY1) #3: Sun Nov 20 23:47:23 CST 1999 
No match. 
if:Expression syntax. 
porky/serv/wl%ls 
hello 
porky/serv/wl% 
porky/serv/wl%cd/ 
porky/%ls 
Mail/ dev/ home/ mnt/ sbin/ 
usr/ 
News/ domain/ home1/ net/ serv/ 
var/ 
Record/ etc/ kadb* pcfs/ sys@ 
vmunix* 
bin@ export/ lib@ print tmp/ 
boot gofer/ lost+found/ record tmp_mnt/ 
porky/% 

The above Telnet command is used to find a remote computer called porky.math.ukans.edu. after finding this computer, the computer that has been online has become a terminal. the dialog displayed on the screen is the same as the terminal connected to the user on the host. The user must register to enter (login) and log out (logout ). after login, You can provide any commands suitable for remote systems. Because "porky.math.ukans.edu" is oriented to UNIX systems, all standard UNIX Commands (like ls and pwd) can be used. when you exit from the remote system, you can also exit from Telnet to run your local system. in fact, Telnet is a tool that can be registered to the remote computer system.