Code Style - Common file properties

With the exception of special-purpose files, each source file must ontain the GNU copying statement, CVS Id tag, and author's name and e-mail address.

C, Perl, and Bourne shell files must contain Gnu Emacs variables at the end of the file:

# Local Variables:
# mode: perl
# indent-tabs-mode: nil
# perl-indent-level: 4
# End:

Each file must always end with the linebreak. Otherwise it might conflict with CVS. All files must have Unix linebreak format.

Source - Torrus.org