A shell script to auto login a telnet server

A shell script to auto login a telnet server without inputing username and password via Expect language.
[Chinese]一个不用输入用户名密码的自动登录telnet服务器的脚本（使用expect）

---

#!/usr/bin/expect
set SERVER "172.31.3"
set USER "myusername"
set PASSWD "PASSWORD"
if { $argc } {
spawn telnet $SERVER.$argv
} else {
spawn telnet $SERVER.142
}
expect "password:"
send "$PASSWD\n"
expect "#"
send "ls\n"
interact

---

Thanks google.