Solaris

#!/bin/bash
USERS="bob john carry"
for user in $USERS;
do
echo "Changing password for" $user
./chpass.exp $user
done

#!/usr/local/bin/expect -f

set force_conservative 0  ;# set to 1 to force conservative mode even if
                          ;# script wasn't run conservatively originally
if {$force_conservative} {
        set send_slow {1 .1}
        proc send {ignore arg} {
                sleep .1
                exp_send -s -- $arg
        }
}

set username [lindex $argv 0]
set timeout -1
spawn passwd $username
match_max 100000
New Password: "
send -- "test1\r"
expect -exact "\r
Re-enter new Password: "
send -- "test1\r"
expect eof