The following counts all the lines in all *.rb files in the app directory. Run several of these commands to get a rough estimate of the LOC.

find app -name *.rb -exec wc {} \; | awk '{a+=$1;print a}' | tail -1

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

Count lines of code