ファイル名をコマンドラインから渡す
filename = ARGV[0] text = File.read(filename) puts text
filename = ARGV[0] text = File.readlines(filename) puts text
filename = ARGV[0] text = File.readlines(filename) text.each_with_index do |line, i| puts "#{i}: #{line}" end
filename = ARGV[0] text = File.read(filename) puts text
filename = ARGV[0] text = File.readlines(filename) puts text
filename = ARGV[0] text = File.readlines(filename) text.each_with_index do |line, i| puts "#{i}: #{line}" end