To extract duplicate files from a system

sir, i m working on project to find duplicate files from a system . can any one give me some idea how should I start ?

I have written one in Java and in Python.
My approach was to take the SHA1 hash of each file and use this as the key in a map with the file name being the value.
I traverse the file system building the hash mapping as I go along. When I find a SHA1 hash that is already in the map I add the pair of associated file names to a list of possible duplicate files.
After I have traversed the set of files I check all the potential duplicates for equality.

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break anything. The second line pulls the parameter into a variable, and the 3rd line uses delayed expansion on that new variable. Before implementing delayed expansion I had problems with file paths which included parentheses.
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sigh
Please make the extra effort to write out words such as "could", "you", and "please". The extra keystrokes won't cost much in the way of time, and the enhanced clarity will be appreciated by those communicating on a forum with international readership. Also, it will give the appearance that you take your question seriously, which will in turn make your question look more interesting to answer.
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To extract duplicate files from a system

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