Diffstat reads the output of the diff command and
displays a histogram of the insertions, deletions,
and modifications in each file. Diffstat is
commonly used to provide a summary of the changes
in large, complex patch files.
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The "-S", "-D", and "-m" options were added to
provide a way to show the amount of difference
relative to the total sizes of the files. The "-q"
option was added to suppress the message for empty
files.
