Expect script for SSH login

#!/usr/bin/expect -f
# Hari Prakash for SSH login
#Set Variables
set SYSTEM [lindex $argv 0]
set USER [lindex $argv 1]
set PASSWORD [lindex $argv 2]
set COMMAND [lindex $argv 3]
set timeout -1
if { [llength $argv] < 4 } {
send_user " usage: olssh.sh host user password command\r\n"
exit 1
}
#Spawn ssh process
spawn ssh $USER@$SYSTEM $COMMAND
match_max 100000
expect "*?assword:*" {
send "$PASSWORD\r"
exp_continue
} "Are you sure you want to continue connecting (yes/no)? " {
send "yes\r"
exp_continue
}