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  1. bash-4.2$ ruby -e 'a=gets;a.split("").uniq.map{|x|puts"#{x} : #{a.count x}"}' <<< 'Hello world'
  2. H : 1
  3. e : 1
  4. l : 3
  5. o : 2
  6.   : 1
  7. w : 1
  8. r : 1
  9. d : 1
  10.  
  11.  : 1
  12.  
  13. bash-4.2$ echo 'Hello world' | ruby -e 'a=gets;a.split("").uniq.map{|x|puts"#{x} : #{a.count x}"}'
  14. H : 1
  15. e : 1
  16. l : 3
  17. o : 2
  18.   : 1
  19. w : 1
  20. r : 1
  21. d : 1
  22.  
  23.  : 1
  24.  
  25. bash-4.2$ echo -n 'Hello world' | ruby -e 'a=gets;a.split("").uniq.map{|x|puts"#{x} : #{a.count x}"}'
  26. H : 1
  27. e : 1
  28. l : 3
  29. o : 2
  30.   : 1
  31. w : 1
  32. r : 1
  33. d : 1
  34.  
  35. bash-4.2$ printf 'Hello world' | ruby -e 'a=gets;a.split("").uniq.map{|x|puts"#{x} : #{a.count x}"}'
  36. H : 1
  37. e : 1
  38. l : 3
  39. o : 2
  40.   : 1
  41. w : 1
  42. r : 1
  43. d : 1
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