I have written a script that extracts all XML entities from a file using a regex (&[^;]+;).

The output has a header (just plain text) and several thousand matching strings/XML entities with one occurrence per line:

List of entities in 'input.xml':
========================================================================
ü
ü
ä
Ä
ü
ä
ü
–
...

I would like to modify the output so that

• each type of XML entity is only listed once (or in other words duplicates are excluded from the output),
• the XML entities are sorted alphabetically on the basis of their name, e.g. auml > ouml > uuml and
• the respective number of occurrences will be given.

So a sample output could like this:
ä 357
ö 231
...

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