How many lines are in the 700GB file? What percentage of the file does the first 300M lines take up? At work, we have lots of 20-30GB text files that gzip dow

How many lines are in the 700GB file? What percentage of the file does the first 300M lines take up? At work, we have lots of 20-30GB text files that gzip down to 14-15% of the original size. If this 700GB file was similarly populated, a gzip of the whole thing would be 100GB or so. Doing a tail piped to the gzip command would work.