Manipulating programs

Hi,



I'm trying develop a program that read the answers of interactives
programs like su and passwd.On the fact i need change the password
(/etc/shadow) of some users from web(CGI/PERL).

How i do this? I see a example of this but the script use a library
called chat2.pl. I think that this library is discontinued on perl
5.8.


Anyone have the solution?


Tranks for all



Augusto Flavio