[Ubuntu] Simple method to login SSH without insert user name and password via expect in linux

All I test the code below is under Ubuntu.

1. Install expect

sudo apt-get install expect

2. Create a .sh file, here is login.sh, and insert the code as below

#!/usr/bin/expect -f
spawn ssh username@hostname
expect "password:"
send "password\r"
interact

Please note that you have to change to codes what is marked with red.

3. Run it

./login.sh

By the way, there is an other method that can switch via expect to login many website

#!/usr/bin/expect -f
set project [lindex $argv 0]
switch $project {
    website1 {
        set path user1@website1.com
        set password password1
    }
    website2 {
        set path user2@website2.com
        set password password2
    }
    default {
        exit
    }
}
spawn ssh $path
expect "password:"
send $password
send "\r"
interact

Run it

./login.sh website1