The computer's master control program. When a computer is turned on, a small "boot program" loads the operating system. Although additional system modules may be loaded as needed, the main part ...

Mac OS X was based on technology from NeXT Computer ... you can see from the list above, with the exception of the first OS X beta, all versions of the Mac operating system from 2001 to 2012 ...

Users control the computer by typing in commands ... They still exist within modern operating systems, for example the command prompt app in Windows, and Terminal in macOS. Line 2 lists the ...