You can use find and awk to counting the total number of lines in multiple files
Solution
Using the usual GNU tools, you can write the following script (replace "*.java" with your language file type):
find . -name "*.java" -exec wc -l '{}' \; | awk '{ sum += $1 } END { print sum }'
You can put this command in a bash script or create and alias
This is completely pointless. A much simpler way to do this is:
wc -l *.php
This will output the line count for each file, but with a total at the end as well.