Originally Posted by cedkhader
can any one tell me how are the login file like .bashrc and .profile_bash accessed and processed to enable the login.
where can i find documentation about editing these files ??
The INVOCATION section of the bash man page describes how files like .bashrc and .profile_bash are used under various bash startup scenarios.
There are many examples of customising them, for example here
Linux' man pages and the Internet are great resources. Most of us use them frequently; it is effort well repaid to familiarise with them.