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Zero-copy programming techniques can be used when exchanging data within a user space process (i.e. between two or more threads, etc.) and/or between two or more processes (see also producer–consumer problem) and/or when data has to be accessed / copied / moved inside kernel space or between a user space process and kernel space portions of operating systems (OS).
In computing, XCOPY is a command used on IBM PC DOS, MS-DOS, IBM OS/2, [1] Microsoft Windows, [2] FreeDOS, [3] ReactOS, [4] and related operating systems for copying multiple files or entire directory trees from one directory to another and for copying files across a network.
Copy entire directory trees. Xcopy is a version of the copy command that can move files and directories from one location to another. XCOPY usage and attributes can be obtained by typing XCOPY /? in the DOS Command line. The command is available in MS-DOS versions 3.2 and later. [1]
This article provides a list of inbuilt and third party file copying and moving software - utilities and other software used, as part of computer file management, to explicitly move and copy files and other data on demand from one location to another on a storage device. File copying is a fundamental operation for data storage.
Files may be copied to device files (e.g. copy letter.txt lpt1 sends the file to the printer on lpt1. copy letter.txt con would output to stdout, like the type command. Note that copy page1.txt+page2.txt book.txt will concatenate the files and output them as book.txt. Which is just like the cat command). It can also copy files between different ...
Copy-on-write (COW), also called implicit sharing [1] or shadowing, [2] is a resource-management technique [3] used in programming to manage shared data efficiently. Instead of copying data right away when multiple programs use it, the same data is shared between programs until one tries to modify it.
The resulting object is called an object copy or simply copy of the original object. Copying is basic but has subtleties and can have significant overhead. There are several ways to copy an object, most commonly by a copy constructor or cloning. Copying is done mostly so the copy can be modified or moved, or the current value preserved.
COPY Copies one file to another (if the destination file already exists, MS-DOS asks whether to replace it). (See also XCOPY, an external command that could also copy directory trees). CTTY Defines the device to use for input and output. DATE Display and set the date of the system. DEL, ERASE Deletes a file.