How to compare text
Like the titl开发者_如何学Ce, How to compare text?. For a example, go to textdiff.com.
Check out Levenshtein distance. This is a fairly general algorithm for identifying differences between two strings.
You may want to have a look at Pear's Text_Diff
http://pear.php.net/package/Text_Diff/
http://en.wikipedia.org/wiki/Longest_common_subsequence_problem
if you're looking for a terminal command, check out diff, found in linux by default. You can also have it on windows by installing cygwin [with a LOT of excess baggage. :\ ]
I would suggest Jaccard's Similarity coefficient. Treating each sentence as a unit.
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