How can I read lines from the end of file in Perl?

Question

I am working on a Perl script to read CSV file and do some calculations. CSV file has only two columns, something like below.

One Two
1.00 44.000
3.00 55.000         


        

Answer 1

If you know the number of lines in the file, you can do

perl -ne "print if ($. > N);" filename.csv

where N is $num_lines_in_file - $num_lines_to_print. You can count the lines with

perl -e "while (<>) {} print $.;" filename.csv