Counting lines including subdirectories

[Matt Arnilo S. Baluyos (Mailing Lists)]

Hello everyone,

Would anyone know of a one-liner that allows you to count the number
of lines including the subdirectories? I'm trying to find out how many
lines of code there are in a web application.

It would also be better if it has an option to exclude specific file extensions.

Best Regards,
Matt

-- 
Stand before it and there is no beginning.
Follow it and there is no end.
Stay with the ancient Tao,
Move with the present.