is there a way in perl to get the env variables generated by appln s/w may be by giving porcess ID or appln name?

There's no portable way in *nix period to get the environment of a process other than yourself.

A glance shows some things on CPAN like Shell::GetEnv that may let you run subprocesses and get their info, but I don't know how well that would work with long-running processes, and doesn't help with non-descendant processes anyway.

edit: markup fix