The venerable "expect" - scripts

1.exp

#!/usr/bin/expect

# start ssh process
spawn ssh root@expect

# expect this string on the screen
expect "password"

# type this to the screen
send "foobar123\r"

expect "root@expect2"

# return control to the user
interact

2.exp

#!/usr/bin/expect

# the script won't make output
log_user 0

spawn ssh root@expect

expect "password"
send "foobar123\r"
expect "root@expect2"

puts "successfully logged in!"
send "\r"

interact

3.exp

#!/usr/bin/expect

# the script won't make output
log_user 0

set timeout 10

spawn ssh root@expect

expect "password"
send "foobar123\r"

expect {
  "root@expect2" {
    puts "successfully logged in!"
    send "\r"
  }
  timeout { puts "Fail"; exit 1 }
}

interact

4.exp

#!/usr/bin/expect

# the script won't make output
log_user 0

set timeout 10

spawn ssh root@expect

expect "password"
send "foobar123\r"

expect {
  "root@expect2" {
    puts "first hop successful"
  }
  timeout { puts "Fail"; exit 1 }
}

send "ssh root@104.236.13.122\r"

expect "password"
send "foobar456\r"

expect {
  "root@expect3" {
    puts "second hop successful"
    send "\r"
  }
  timeout { puts "Fail"; exit 1 }
}

interact