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  • How can grep search files that can't even be listed by e.g. ls? Besides, most of the files are images, spreadsheets and tarballs.
    – DarenW
    Commented May 10, 2011 at 14:34
  • @darenw You don't grep for files, you grep for data bygreping the raw HDD (something like /dev/sda) for bytes. Read the second link (the cyberciti) - it explains the process well.
    – new123456
    Commented May 10, 2011 at 20:04