除了在Telnet是如何工作的例子介绍的以外,Telnet还有很多的特点。Telnet可发送除
了"escape"的任何字符到远程主机上。因为"escape"字符在Telnet中是客户机的一个特殊的命令
模式，它的默认值是"Ctrl-]"。但要注意不要与键盘上的Esc键混淆，我们可以设定"escape"为任
意某个字符，只是对Telnet来说以为着该字符不可能再被传送到远程主机上，而Esc键是一非打印
字符，Telnet用它来删除远程系统中的命令。而且还应记住，"escape"字符并不总以"Ctrl-]"来
表示。
可以仅仅键入Telnet,后面不带机器字句。这种情况下所看到的是Telnet>,这是告知
Telnet在等待键入命令，比如键入问号"?"那么就得到一个有用的命令表：
telnet: ?
Commands may be abbreviated, Command are:
open connect to a site
close close currect connection
quit exit telnet display display operating parameters
send transmit special characters ('send ?' for more)
set set operating parameters('set ?' for more)
status print status information
toggle toggle operating parameters('toggle ?' for more)
mode try to enter line-by-line or character-at-a-time mode
? print help information
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:
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%cd/
porky/%CTRL-]
telnet:?
Commands may be abbreviated, Command are:
open connect to a site
close close currect connection
quit exit telnet display display operating parameters
send transmit special characters ('send ?' for more)
set set operating parameters('set ?' for more)
status print status information
toggle toggle operating parameters('toggle ?' for more)
mode try to enter line-by-line or character-at-a-time mode
? print help information
telnet:set escape ^b
escape character is ’^b’
porky/%logout
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