Shell Programming and Scripting

#!/usr/bin/expect
##assign the first parameter to address and 2nd to username
set address [lrange $argv 0 0]
set username [lrange $argv 1 1]
 
# Prompt for password (without echo) and store it
stty -echo
send_user -- "Password for $username@$address: "
expect_user -re "(.*)\n"
send_user "\n"
stty echo
set pass $expect_out(1,string)
 
#Spawn rlogin
spawn rlogin $username@$address
 
# Process result
expect {
     -re "Last login:" { interact }
     -re "an invalid password" { puts "$expect_out(buffer)";close; exit}
     -re "(p|P)assword:" {send "$pass\r";exp_continue}
     "Connection refused" {puts "Host error -> $expect_out(buffer)";close; exit}
     "Connection closed"  {puts "Host error -> $expect_out(buffer)";close; exit}
     "no address.*" {puts "Host error -> $expect_out(buffer)";close; exit}
     timeout {puts "Timeout error. Is device down or unreachable??";close; exit}
}