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+The sortu program is a replacement for the sort and uniq programs. It is
+common for Unix script writers to want to count how many separate patterns
+are in a file.  For example, if you have a list of addresses, you may want
+to see how many are from each state. So you cut out the state part, sort
+these, and then pass them through uniq -c. Sortu does all this for you in a
+fraction of the time.
+
+Sortu uses a hash table and some decent line processing to provide this
+functionality.  For a relatively small number of keys, it can be signifcantly
+smaller than using sort, because it does not have to keep temporary files.
+If you are dealing with a large number of unique keys then sortu will run out
+of memory and stop. Sortu has some basic field and delimiter handling which
+should do most basic awk or cut features to separate out the field that you
+are sorting on.
+
+WWW: http://256.com/sources/sortu/