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A B C D E F G H I J K L M N O P Q R S T U V W Y

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• hard disks, device names
• hardware problems
• head(C), ``Reading just the first or last lines of a file'', ``Looking at the beginning and end of a file''
• header files directory
• help
  • apropos(C)
  • man(C)
  • whatis(C)
• hidden files
• home directory, ``Your home directory'', ``Changing directories''
• HOME variable
• hyphen (-)