terminal - How can I list unique characters used in a text file using linux command line tools? -

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I would like to list a set of characters described in the text file using the Linux command line tool. How can I achieve this ?

uniq utility works only on lines.

I od 

  od- Using cvAnone -w1   
, it shows  letters  \ escapes  other for non-displayable  
 
 Example:  
 Therefore, to list Unix:  
  od-cvAnone -w1 | Sort -bu   
 or to create the top 20 histogram:  
  od-cvAnone -w1 | Sort-b UNIK-C | Sort-RN | Head N-20   
 See this

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