/

     - The home page or root directory of GNU.WIKI.

man1/

     - General system programs and commands.

man2/

     - Information covering system calls.

man3/

     - Library functions, covering in particular the C standard library.

man4/

     - Special files (usually devices, those found in /dev) and drivers.

man5/

     - File formats and conventions.

man6/

     - Games, screensavers and other amusements.

man7/

     - Miscellaneous commands and information.

man8/

     - System administration commands and daemons.

man9/

     - Kernel routines [Non standard]

howto/

     - This are contains helpful How-To guides.

abs/

     - The Advanced Bash Scripting Guide book in HTML format.

phpdocs/

     - This manual consists primarily of a function reference, but also contains a
       language reference, explanations of some of PHP's major features, and other
       supplemental information.