用expect做自动运行脚本

下面的脚本演示了在Ubuntu上安装expect，写一个切换用户的expect脚本，并运行脚本看到效果的过程。

root@guserver:~# apt-get install expect
godu@guserver:~$ cat su.exp
#!/usr/bin/expect
set timeout 20
set user [lindex $argv 0]
set password [lindex $argv 1]
spawn su $user
expect "Password:"
send "$password\r";
interact
godu@guserver:~$ ./su.exp chad mypwd
spawn su chad
Password:
chad@guserver:/home/godu$

参考：6 Expect Script Examples to Expect the Unexpected (With Hello World)