Expect script to SSH-access a machine, login to another user, run x11vnc and close the session after close the VNC client

expect-x11vnc.sh

#!/usr/bin/expect --

# Argument:
#	argv0 = host
#
# Usage:
# 	expect.sh ip-or-hostname

spawn ssh -o StrictHostKeyChecking=no -p 22 -L 9000:localhost:5900 user@[lindex $argv 0]

set timeout 120

expect {
	
    timeout {
        puts "Connection timed out"
        exit 1
    }

    "yes/no" {
        send "yes\r"
        exp_continue
    }

    "assword:" {
        send -- "password-1\r"
        expect "@hostname:"
    }
}

send -- "su another-user\r"
expect "Password: "
send -- "password-2\r"
expect "another-user@hostname:"


send -- "DISPLAY=:0 x11vnc\r"
set viewerexited "false"
while {$viewerexited == "false"} {
	
	sleep 1
	
	expect {
		
		"viewer exited." {
			
			set viewerexited true
			
		}
	}
}

# Logout from 'user' user
send -- "exit\r"
expect "exit"

# ends SSH session
send -- "exit\r"