Need Unix Command Help finding unique values.

I need to redo my style sheets for 150 jsp files
 
I want to find all the unique classes among my jsp files.  


find . -name "*.jsp" -print |  xargs grep "class="  | wc -l
    produces 4000+ results

My guess is that there are only about 200 unique terms in the quotes after class="className".

For example if this was my results, there are only 3 unique classes.
   <td class="columnValue">
   <td class="myOtherClass">
   <td class="aThirdClass">
      <td class="aThirdClass">

How do I build a unix command to only show me the unique class="className"  where className is unique?

tmonteitAsked:
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ozoCommented:
perl -MFile::Find -le '$/="class=";find(sub{return unless /\.jsp$/;@ARGV=($_);/^"(.*?)"/&&$s{$1}++while<>},"."); print for sort keys %s'
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TintinCommented:
find . -name "*.jsp" -print |  xargs grep "class=" | sed 's/<td class="\(.*\)">/\1/' | sort -u


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ozoCommented:
It may be beter to use
sed 's/.*<td class="\(.*\)">.*/\1/'
assuming there's no more than one <td class= per lie
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TintinCommented:
Thanks ozo.  I forgot the .* at the beginning
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