1. sh命令

2. expect命令

2.1 安装expect

sudo apt-get install expect

3. 实战

3.1 expect+sh实现批量自动创建用户

#!/bin/bash
#!/user/bin/expect

passwd=Fight666
list="username1 username2"
addgroup groupname1
for i in $list;
do
expect << EOF
	set timeout 10
	spawn adduser $i
	expect "*password:" { send "$passwd\r"}
	expect "*password:" { send "$passwd\r"}
	expect "]:" { send "\r" }
	expect "]:" { send "\r" }
	expect "]:" { send "\r" }
	expect "]:" { send "\r" }
	expect "]:" { send "\r" }
	expect "*Y/n]" { send "y\r" }
EOF
usermod -s /bin/bash -g groupname1 $i;
done

参考链接：
expect用法介绍
Linux中EOF和Expect命令详解