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# where .py is the extention to search on
( find ./ -name '*.py' -print0 | xargs -0 cat ) | wc -l

# also, 
wc -l **/*rb

# also, this counts every line of every file
grep '' -R . | wc -l 

# wc will print the number of lines in a file or multiple files
wc -l app/controllers/*.rb