telnet 命令用来远程连接 某个ip 的某个端口
1） telnet 210.14.140.82 2181 回车 --连接ip为210.14.140.82
端口为2181的服务， 可用来测试2181端口是不是已开通
Trying 210.14.140.82... Connected to 210.14.140.82. Escape character is '^]'.
2）ctrl
+ ] 回车 --回到telnet命令
telnet>
3）? 回车 --给出提示命令
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 set treatment of special characters
z suspend telnet
environ change environment variables ('environ ?' for more)
4）
quit 回车 ---退出telnet 链接
Connection
closed.