i want know how to access the file from application server of unix.please help me out.

ssh to the server, navigate to the location where the file (e.g. log) that you need to access is kept, and open it. Or if it's an application, run it after you've ssh'ed to the server.

Depending on the file, the app it is used with, and flavor of unix you are using on the server, and the Mac you are using to connect, your experiences with command line in general etc, the answer may be a bit different or more detailed than that. So please tell a bit more about the app and the environment if you need more detailed howto.