Adding and modifying default environment files
You can modify the default configuration files that are added to the
home directory for a new account. For example,
has prototype .login and .cshrc files that
are installed in a user's directory when csh is selected as that
user's login shell. Each shell has a directory of these prototype
files in /usr/lib/mkuser.
You can also add login shells (and configuration files) to the set of login shells available from the Account Manager. Examine the existing files and follow their example. Make sure the permissions and ownership are consistent with these files. When you install the files, the new shell is available in the Account Manager.