Ctags and etags
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Unfortunately there exists several good ctags and etags implementations.
They have different supported languages and different options and
features. The several versions are:
ctags ctags from Darren Hiebert, supports e.g. Eiffel
ctags -e etags from Darren Hiebert, supports e.g. Eiffel
gnuctags ctags from Emacs sources, supports e.g. Lisp
etags etags from Emacs sources, supports e.g. Lisp
The version of Darren Hiebert is also called the Exuberant Ctags.
Your SuSE team