find . -type f \( -name "*.c" \) | sort > _names_c.txt
find . -type f \( -name "*.h" \) | sort > _names_h.txt
find . -type f -name "*.c" -exec dirname {} \; | sort -u > _directories_c.txt
find . -type f -name "*.h" -exec dirname {} \; | sort -u > _directories_h.txt
