title: Script to copy files on CD and not on hard disk to a new directory
body: <p>I need to copy files from a set of CDs that have a lot of duplicate content, with each other, and with what's already on my hard disk.  The file names of identical files are not the same, and are in sub-directories of different names.  I want to copy non-duplicate files from the CD into a new directory on the hard disk.  I don't care about the sub-directories - I will sort it out later - I just want the unique files.  </p>
  
  <p>I can't find software to do that - see my post at SuperUser <a href="https://superuser.com/questions/129944/software-to-copy-non-duplicate-files-from-cd-dvd">https://superuser.com/questions/129944/software-to-copy-non-duplicate-files-from-cd-dvd</a>  </p>
  
  <p>Someone at SuperUser suggested I write a script using GNU's "find" and the Win32 version of some checksum tools.  I glanced at that, and have not done anything like that before.  I'm hoping something exists that I can modify.</p>
  
  <p>I found a good program to delete duplicates, Duplicate Cleaner (it compares checksums), but it won't help me here, as I'd have to copy all the CDs to disk, and each is probably about 80% duplicates, and I don't have room to do that - I'd have to cycle through a few at a time copying everything, then turning around and deleting 80% of it, working the hard drive a lot.  </p>
  
  <p>Thanks for any help.  </p>