Operating Systems

Operating Systems

1. the low-level software that supports a computer's basic functions, such as scheduling tasks and controlling peripherals.

2. An operating system (OS) is software that manages computer hardware and software resources and provides common services for computer programs.

3. apple

4. A file manager or file browser is a computer program that provides a user interface to manage files and folders. The most common operations performed on files or groups of files include creating, opening (e.g. viewing, playing, editing or printing), renaming, moving or copying, deleting and searching for files, as well as modifying file attributes, properties and file permissions. Folders and files may be displayed in a hierarchical tree based on their directory structure. Some file managers contain features inspired by web browsers, including forward and back navigational buttons. Some file managers provide network connectivity via protocols, such as FTP, NFS, SMB or WebDAV. This is achieved by allowing the user to browse for a file server (connecting and accessing the server's file system like a local file system) or by providing its own full client implementations for file server protocols.

   • ontrols the backing store and peripherals such as scanners and printers deals with the transfer of programs in and out of memory organises the use of memory between programs
     • organises processing time between programs and users maintains security and access rights of users deals with errors and user instructions allows the user to save files to a backing store provides the interface between the user and the computer - for example, Windows Vista and Apple OSX
       • When the computer has to react within a guaranteed time to an input, a real-time operating system (RTOS) is used. For example, the engine management system within a car uses a real-time operating system in order to react to feedback from sensors placed throughout the engine. A real-time operating system does not necessarily have to be fast. It simply has to be quick enough to respond to inputs in a predictable way. Embedded computers often contain an RTOS as many are used to control something. Computers operating in real time are often dedicated to the control of systems such as industrial processes, planes and space flights. Multi-programming