function to sort a shell history file and print out the lines of commands that has been executed the most

top_history.rb

def sortCommands(histFile, limit=10)
  file = open(histFile, 'r')
  lines = file.readlines
  file.close
  freqs = Hash.new(0)
  lines.each do |line|
    freqs[line] += 1
  end
  a = freqs.sort_by {|k, v| -v}[0..limit]
  i = 0
  limit.times do
    puts a[i][0]
    i += 1
  end
end

sortCommands('.histfile')