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Replace lines from one file to another

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# 1  
Old 09-30-2010
Replace lines from one file to another
Hello,
I have 8 lines containing these unique words in both files

645147468537
673962863160
673962864957
691717701950
707917019907
790085591726
792975507744
852174812753

file.dat.orig (has 1000 lines) and file.dat(has only 8 lines)

I want to replace those lines in file.dat.orig by the lines in file.dat

Updated
To clarify - both the files have difference in lines (except those unique words). Hence i want to replace.
Thanks in advance - Jak
Last edited by jakSun8; 09-30-2010 at 12:57 PM.. Reason: Clarification
# 2  
Old 10-01-2010
you need provide the sample on both file.dat.orig and file.dat, and tell us your expect output.
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