|  | Freq reads the given files (default standard input) and prints
    histograms of the character frequencies. By default, freq counts
    each byte as a character; under the −r option it instead counts
    UTF sequences, that is, runes. 
    
    
    Each non-zero entry of the table is printed preceded by the byte
    value, in decimal, octal, hex, and Unicode character (if printable).
    If any options are given, the −d, −x, −o, −c flags specify a subset
    of value formats: decimal, hex, octal, and character, respectively. 
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