Process itself which always exists and is represented

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process itself, which always exists and is represented by a statically allocated task_struct. All processes in Linux are collected in two different ways. The first is a hash table, which is hashed by the PID value; the second is a
OPERATION SYSTEMS COMPARISON10circular doubly linked list. The circular list is ideal for iterating through the task list. As the list iscircular, there's no head or tail; but as the init_task always exists, you can use it as an anchor point to iterate further. (IBM, 2008)Unix Process ManagementWhen you execute a program on your UNIX system, the system creates a special environment for that program. This environment contains everything needed for the system to run the program as if no other program were running on the system. Whenever you issue a command in UNIX, it creates, or starts, a new process. If you used the lscommand to list directory contents, you would start a process. A process, in simple terms, is an instance of a running program. The operating system tracks processes through a five digit ID number known as the pid or process ID. Each process in the system has a unique pid. Pids eventually repeat because all the possible numbers are used up and the next pid rolls or starts over. At any one time, no two processes with the same pid exist in the system because it is the pid that UNIX uses to track each process. (Tutorialspoint, 2014)File ManagementWindows File ManagementEvery Windows folder provides easy access to common file and folder management tasks. When you open any folder on your computer, a list of hyperlinked tasks is displayed next to the folder contents. You can select a file or folder, and then click a task to rename, copy, move,or delete it. You can also send a file in e-mail or publish it to the Web. In addition to the basic file
OPERATION SYSTEMS COMPARISON11and folder tasks provided in all Windows folders, there are several folders that provide links to specialized tasks. My Pictures and My Music folders provide task links that can help you manageyour picture and music files. In the My Computer folder, you can view and select the drives on your computer, the devices with removable storage, and the files stored on your computer. You can use the task links in this folder to view information about your computer, change system settings using Control Panel, and perform other system management tasks. Use the Recycle Bin tasks to empty the Recycle Bin or restore deleted files and folders to their original locations. The Recycle Bin is displayed on your desktop. (Microsoft, 2015)Mac OS File ManagementThe OS X file management system is designed for Macintosh computers. This way, both users and the software have access to the file system. The user can access the file system through the finder which gives you a view of the file system by hiding or renaming some files and directories. Apps access the file system by using the system interfaces which show every part of the file system exactly as it is shown on the disk. Some of the commonly used directoriesin OS X are; /applications, library, /network, /system, /users. OS X hides many files and directories that should never be used from the user.

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