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expect spawn无法同一个进程里执行?

#!/usr/bin/expect
spawn sudo pwd
expect?"password"
sent "mypassword
"

程序到这里,应该是已经获得了sudo运行免密码,也就是第一次sudo pwd的时候,我用expect输入了密码mypassword,确实验证过了,但是我继续sudo ls的话,他就提示还要输入sudo密码了。

#!/usr/bin/expect
spawn sudo pwd
expect?"password"
sent "mypassword
"
spawn sudo ls   #这里不行了,又弹出要输入密码了,这是为何?

第一个spawn开启了一个进程输入了密码获得了sudo权限,如何让第二个spawn和第一个spawn是同一个进程啊?我想要一只免密码sudo


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