In Unix, it is possible to customize the user's login to suit his needs. Many of the changes saved will be for terminal settings, environment variables, and path information. The files are located in the user's home directory. The user's directory may also contain several other dot files or directories for specific applications. Application usually applications have a GUI interface built in the edit and save these files, but not all do so some will have to be manually edited.
Many people like to place command aliases the dot files for frequently used commands.
In the example .kshrc below, several alias are created to mimic DOS commands. For more complex tasks, it is best to create functions. The function does not have any error checking features so the users must be familiar with how the function works. Unlike DOS, there is no such thing as a hidden file in Unix. If you need to prevent people from reading or modifying files, then you will need to change the permissions mode of the file itself or the directory while the file resides in.