answer for cynic limb at ruby talk

=begin
The following block of code belongs to a program that is under construction currently
=end

#!/usr/bin/env ruby

print "File name: "
filename = gets.chomp

unless File.file? filename
  puts "The given name '#{filename} is not a file"
  exit
end

unless File.readable? filename
  puts "The given file '#{filename}' is not readable."
  exit
end

File.open filename, 'r' do |f|
  f.each_line do |line|
    puts line
  end
end