更好的自动ssh登录

解决~/.ssh/known_hosts 过期问题。
bash + expect

bash：ssh.sh

#!/bin/bash

help(){
    echo "usage:  [password]"
}
[ -z "$1" ] && { help; exit 1; } || {
    case $1 in
        -*) help; exit ;;
        *) ip=$1;;
    esac
}
shift
ssh.exp "$ip" "$@"
[ "$?" = "1" ] && ssh-keygen -R $ip && ssh_ivie.exp "$ip" "$@"

expec
ssh.exp

#!/usr/bin/expect -f

proc help {} {
puts {usage: <ivie_ip> [password]}
}

if {$argc<1} { help ; exit}
set ip [ lindex $argv 0 ]

set password rootroot
if {$argc==2} { set password [lindex $argv 1] }


# close the output
log_user 0


set timeout 30
spawn ssh -XY root@$ip
expect {
    -re ".*:~ # " {}
    "Password: " { send "$password\r" }
    "(yes/no)?" {send "yes\r"; exp_continue}
    "Host key verification failed" { send_user "run: ssh-keygen -R $ip" ; exit 1 }
    timeout {puts "check your ip: $ip"; exit 2}
    eof { puts "check your ip: $ip" ;exit 3 }
}
interact

我测试过在一个expect中完成，但是没有成功。还望有谁能够完成，给予指教。