expect自动执行对话切换到root用户

1.ubuntu上安装expect:

sudo apt-get install expect

2.查看expect安装成功没

dpkg -s expect
状态：

Status: install ok installed

3.查看expect安装到哪个目录

whereis expect

结果：

expect: /usr/bin/expect /usr/bin/X11/expect /usr/share/man/man1/expect.1.gz

4.实现自动切换到root用户的功能

$ vi su_root.exp 
输入如下片段
#!/usr/bin/expect
spawn su - root
expect {
 "密码：" { send "your password\r"; exp_continue }
}
interact

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