Plan 9 from Bell Labs - manpages
        
 (DIR) manpages 1 Commands
 (DIR) manpages 2 System and library calls
 (DIR) manpages 3 Devices
 (DIR) manpages 4 File servers
 (DIR) manpages 5 Plan 9 File Protocol, 9P
 (DIR) manpages 6 File formats, misc
 (DIR) manpages 7 Databases
 (DIR) manpages 8 System administration
 (DIR) manpages 9 Introduction to kernel functions