Almost all UNIX operating systems have voluminous documentation known as manual pages. Every page is a document.
If one wants to read a page then the command man
at a shell prompt will show the manual, for example, "man ftp". Pages are referred by using the notation "name(manual-section)", for example time(1).
Man Page :: Unix Man Pages - fstatfs64
Browse Linux man pages by name. Choose the first letter of the name of the Linux command, function, or file you are interested in: