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BOOK: Beginning Unix ISBN: 0-7645-7994-0
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Old August 14th, 2009, 04:52 PM
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Question question about a sed command

The answer to Chapter 9's Exercise 3 in the back of the book is:
sed 's/\(NY\) , \(New York\) /\2, \1/'
I don't fully understand this. What are the purposes of the "\" , "(" , and ")" in the command? Also, why are the 2 and the 1 there? Thanks guys.

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