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Entropy

This program calculates entropy of a file byte by byte. The lower the entropy, the more information the file contains, e.g. text file has low entropy, while compressed / encrypted file has high entropy. Entropy varies between 0 (least entropy - file contains only 1 value) and 8 (file contains all possible byte values, with equal probabilities)

Usage

entropy [flags] file
  -b int
    	Number of bins on graph (default 10)
  -g	Show output graph 
  -l int
    	Max graph bar length (default 30)
  -q	Number-only output (quiet mode)

Examples

Get entropy of file.txt:

entropy file.txt

Get entropy of file.txt in quiet mode (outputs only float value, for easier automated processing):

entropy -q file.txt

Graph a histogram of file.txt with default settings:

entropy -g file.txt

Graph a histogram of file.txt with 20 bins:

entropy -g -b 20 file.txt

Graph a histogram of file.txt with 20 bins and max bar length of 60 characters:

entropy -g -b 20 -l 60 file.txt