Command #user can change there own password (inside script..without passwd)

HI,
I have prepared one script, from which user can change there own password across all the nodes he wants.But problem is script is not working because the following command is not working
echo -e "$oldPassword\n$newPassword" | passwd
i have tried to run it manually but it is showing the folowing error....
[testuser@xxxxxx01 ~]$ echo -e test\ntest123|passwd
Changing password for user testuser.
Changing password for testuser
(current) UNIX password: passwd: Authentication token manipulation error
[testuser@xxxxxxx01 ~]$
any idea how to resolve this , or is there any other command where user can change their own password (inside a script).
Regards,
Ani

When you change the password and are not root user, the passwd utility will ask for the current (old) password. You have specified a wrong old password, plus the utility will ask for confirmation of the new password.
<pre>
$ passwd
Changing password for user dude.
Changing password for dude.
(current) UNIX password: asdfasdf
passwd: Authentication token manipulation error
$ passwd
Changing password for user dude.
Changing password for dude.
(current) UNIX password: correct_password
New password: How_will_1_ever_remember
Retype new password: How_will_1_ever_remember
passwd: all authentication tokens updated successfully.
$ old_pwd='How_will_1_ever_remember'
$ new_pwd='My_secret_passord_1'
$ echo -e "$old_pwd\n$new_pwd\n$new_pwd" | passwd
Changing password for user dude.
Changing password for dude.
(current) UNIX password: New password: Retype new password: passwd: all authentication tokens updated successfully.
</pre>
Edited by: Dude on Sep 25, 2012 4:36 PM

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</PRE>
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