#!/usr/local/bin/expect --
# Input: username password
set USER [lindex $argv 0]
set PASS [lindex $argv 1]

if { $USER == "" || $PASS == "" }  {
   puts "Usage:  ./scriptname username password\n"
   exit 1
 }

spawn passwd $USER
expect "assword:"
send "$PASS\r"
expect "assword:"
send "$PASS\r"
expect eof