Simple script that sorts the output from du

sort_du.rb

#!/usr/bin/env ruby

# A program that sorts the output from the command `du -h'
# Use it like: du -h . | $PROGRAM_NAME [-r|--reverse]

SUFFIX = {
  'K' => 1E3,
  'M' => 1E6,
  'G' => 1E9,
  'T' => 1E12,
  'P' => 1E15,
  'E' => 1E18,
  'Z' => 1E21,
  'Y' => 1E24
}

def actual_size(str)
  # Check the list character
  return str.to_f * SUFFIX[str[-1]] if SUFFIX.key?(str[-1])
  str.to_f
end

sorted = STDIN.sort do |a, b|
  size_a = a.split(' ')[0]
  size_b = b.split(' ')[0]

  actual_size(size_a) <=> actual_size(size_b)
end

if ARGV.any? { |arg| arg == '-r' || arg == '--reverse' }
  puts sorted.reverse
else
  puts sorted
end