#! /usr/bin/expect -f

# this script is used to practise the command "expect"

#when "lindex" have been used here, the array index begins with 0 but not with 1

set user [lindex $argv 0]

set host [lindex $argv 1]

set passwd [lindex $argv 2]

set timeout 10

spawn ssh $user@$host

# expect "[yes/no]" {send "yes\r"}  if 'ssh-ing' a server for the first time,

# you most likely encounter the case above concerning RSA

expect "password:" {send "$passwd\r"}

interact

 

# modify the script mode to be 0744

# now, one runs "./login.exp your_name host_name your_passwd" in the bash shell, logging in the server successfully.