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For reverse, there's asc2xml
asc2xml < entitiesfile > utf8file
They come as a part of the html-xml-utils debian package.
PS. Tried to submit sample data, but the site autoconverted the non ascii to html entities. So a bit of imagination is needed.
There are 2 alternatives - vote for the best!
Encodes HTML entities from input (file or stdin) so it's possible to directly past the result to a blog or HTML source file.
Encode HTML entities supporting UTF-8 input and output
The only command-line version of this task I could come up with that properly handles UTF-8 input, too. (Yes, I know how crazy it is to have UTF-8 with HTML entity escapes, but that stuff exists... sadly...; Just check Twitter.)
If you can do better, submit your command here.
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