There are two versions of the "Dotfiles" document, one for users of the tcsh shell and one for users of the bash shell. tcsh was the default shell on Athena for many years, but users who created their accounts in April 2009 or later likely have bash as their default shell. If you're unsure which shell you're using, type the following command in your terminal window:
In the example above, the user is running the bash shell. Users of the tcsh shell would have seen /bin/athena/tcsh as the output of the echo $SHELL command.