Thank you Alexander,
Your tips are really helping me. Actually my intention is to do a particular work (like copy, move etc)using a previleged ID and encrypted password and then exit.
I understand that web access and giving read permission can serve the purpose, but we don't want to access those stuffs except particular user.
Is there any perl module or utility (like File::Copy::Vigilant can varify something) is able to validate user previlege or scope to run as different user?
Thanks again for your input.