su through normal user prompting for password.

I have two users on linux box, say user1 user2.Both the users are having passwords.

Now I would like to run the script from user1 and switch to another user i.e., user2 from the script itself.

** I do have limited access and I am running from the normal user account.Not from the root account.***

Since running from the normal user, it is prompting for password.

Any ideas on this please...
help on the above will be highly appreciated.

Thanks in advance.

If you are not root, why do you expect to be able to masquerade as another user without authentication ?

What process are you trying to achieve?