在运维过程中，常常会telnet某个ip端口，如果 能telnet通，怎么退出呢 ？

1、telnet 63.172.25.18 6463 回车

Trying 63.172.25.18...

Connected to 63.172.25.18 (63.172.25.18).

Escape character is '^]'.

2、ctrl + ] 回车

telnet>

3、? 回车 

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

4、quit 回车

Connection closed.