To list source code from the debugger, use the l command. This command will list a number of source code lines around the line currently being executed.
$ ruby -rdebug problem.rb data.txt
Debug.rb
Emacs support available.
problem.rb:3:lines = File.readlines(ARGV[0])
(rdb:1) l
[-2, 7] in problem.rb
1
2
=> 3 lines = File.readlines(ARGV[0])
4
5 lines.each do|l|
6 nums = l.split /,/
7 nums.map!{|n| n.to_f }
(rdb:1) exit
