telnet中的-8E选项

注意-8E的选项只有在linux机器上有，在windows自带的telnet客户端上没有。

通过-8E连接的telent，可以grep中文，日文字符

 

telnet -8E hostname

-8E
-8      Request 8-bit operation. This causes an attempt to negotiate the
        TELNET BINARY option for both input and output. By default telnet
        is not 8-bit clean.

-E      Disables the escape character functionality; that is, sets the
        escape character to ``no character''.

 

如果使用了escape character，那么在telnet时输入escape character字符会进入command mode，
如下：
[jial@nsw-s-hostserver ~]$ telnet 1.1.1.1 -e d
Telnet escape character is 'd'.
Trying 1.1.1.1...
Connected to 1.1.1.1.
Escape character is 'd'.
Red Hat Linux release 9 (Shrike)
Kernel 2.4.20-8 on an i686
login:
telnet> ?
Commands may be abbreviated.  Commands are:

close           close current connection
logout          forcibly logout remote user and close the connection
display         display operating parameters
mode            try to enter line or character mode ('mode ?' for more)
open            connect to a site
quit            exit telnet
send            transmit special characters ('send ?' for more)
set             set operating parameters ('set ?' for more)
unset           unset operating parameters ('unset ?' for more)
status          print status information
toggle          toggle operating parameters ('toggle ?' for more)
slc             change state of special charaters ('slc ?' for more)
auth            turn on (off) authentication ('auth ?' for more)
encrypt         turn on (off) encryption ('encrypt ?' for more)
forward         turn on (off) credential forwarding ('forward ?' for more)
z               suspend telnet
!               invoke a subshell
environ         change environment variables ('environ ?' for more)
?               print help information
telnet>

参见：

http://man.he.net/man1/telnet
http://linux.about.com/od/commands/l/blcmdl1_telnet.htm