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How is it possible that cp didn't copy all files from a huge directory?

I did cp on a large directory with 5000 files. I checked contents with diff and it was not matching! How is this possible?

I ran cp -rv devholidayge/ holiday/

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Are you sure it completed with a 0 return code and no errors? What is the exact command you invoked? –  zmode Oct 16 '12 at 10:12
    
Does the directory have subdirectories under it? If yes, then cp by itself will not do a recursive copy unless you specify the -R flag. –  M K Oct 16 '12 at 10:15
    
Did you run out of space on the target? –  pjc50 Oct 16 '12 at 10:20
    
@MK yes I used -r –  Sandro Dzneladze Oct 16 '12 at 10:34
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What do the files that didn't copy have in common (if anything)? Were they all over a certain size? Were they all a certain type? –  ChrisF Oct 16 '12 at 10:36
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