Byte frequency counter in ruby

byte_freq.rb

if ARGV.count != 1
    puts "Usage: [command ...] <file>"
    exit
end

f = File.new(ARGV[0], 'r')
hash = Hash.new

f.each_byte do |byte|
    if !hash[byte] then hash[byte] = 1
    else hash[byte] += 1
    end
end

#hash.each { |key, obj|
#    puts "#{key} ('#{key.chr}')\t\t=#{obj}"
#}

# extra stuffs:

arr = hash.sort_by { |k,v| v }


i = 0
while i <= 255
  f = File.new(ARGV[0], 'r')
  
  f.each_byte do |byte|
    print (byte^i).chr
  end
  puts "\n\n"
  puts "-----------------------------------"
  puts "\n\n"
  
  i += 1
end

# arr.each { |obj| 
#   a = ''
#   b = ''
#   obj.each { |obj2|
#     if a == ''
#       a = obj2
#     else
#       b = obj2
#     end
#   }
#   
#   c = a ^ 0xD
#   # i = 0
#   # while i <= 255
#   #   c = a ^ i
#   #   puts "#{i}\t#{c}\t#{c.chr}\t\t#{b}"
#   #   i += 1
#   # end
#   # sleep 0.1
#   # 
#   # puts "------------------------"
#   
#   puts "#{a}\t('#{a.chr}')\t\t#{b}"
#   puts "\t#{c}\t('#{c.chr})\t\t#{b}"
# }

Authored by Alex