Expect+sh realize automatic interaction

1. sh command

2. expect command

2.1 install expect

sudo apt-get install expect

3. actual combat

3.1 expect+sh Realize batch automatic user creation

#!/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

Reference link ：
expect Usage introduction
Linux in EOF and Expect Detailed command