expect用法， 非交互密码输入

用法：expect autossh 192.168.67.251
set username root
set password 123sh
if { $argc != 1 } {
        puts "usage autossh "
                exit 0;
}
set sshkey 1
spawn ssh -t $username@[lindex $argv 0]
       expect  "*(Yes/no)*"  
       send "yes\r"
       set sshkey 1
       expect "*Password:*"  
       send "$password\r"
       set sshkey 0
       expect   eof  
       puts "eof"
        if {$sshkey != 1} {
        expect "*Password*"
       { send "$password\r" }
}