auto generate xilinx authentication token with expect

xilinx_autoGenToken.sh

#!/usr/bin/expect
set installer [lindex $argv 0]
set email [lindex $argv 1]
set password [lindex $argv 2]

spawn $installer -b AuthTokenGen

set timeout -1
set ret 0
expect {
    "E-mail Address:" { send "$email\r"; exp_continue}
    "Password:" {send "$password\r"; exp_continue}
    "Saved authentication token file successfully" {}
    "Authentication error" { set ret 1; }
}

exit $ret