问在自动化过程中无法在Expect Shell脚本中建立主机的真实性时，如何忽略或传递“是”

EN

#!/usr/bin/expect 
set prompt "#|>|\\\$"
spawn ssh dinesh@myhost
expect {
        #If 'expect' sees '(yes/no )', then it will send 'yes'
        #and continue the 'expect' loop
        "(yes/no)" { send "yes\r";exp_continue}
        #If 'password' seen first, then proceed as such.
        "password"
}
send "root\r"
expect -re $prompt

ssh-keyscan hostname.example.com >> $HOME/.ssh/known_hosts