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Pipeline (Unix) A pipeline of three program processes run on a text terminal. In Unix-like computer operating systems, a pipeline is a mechanism for inter-process communication using message passing. A pipeline is a set of processes chained together by their standard streams, so that the output text of each process ( stdout) is passed directly ...
However, prior to the introduction of UNIX OS with its "pipes", redirection in operating systems was hard or even impossible to do. [2] In Unix-like operating systems, programs do redirection with the dup2 (2) system call , or its less-flexible but higher-level stdio analogues, freopen (3) and popen (3) .
Named pipe. In computing, a named pipe (also known as a FIFO for its behavior) is an extension to the traditional pipe concept on Unix and Unix-like systems, and is one of the methods of inter-process communication (IPC). The concept is also found in OS/2 and Microsoft Windows, although the semantics differ substantially.
The vertical bar is used as a special character in lightweight markup languages, notably MediaWiki 's Wikitext (in the templates and internal links). In LaTeX text mode, the vertical bar produces an em dash (—). The \textbar command can be used to produce a vertical bar.
Though it is seldom used (most Dutch keyboards use US International layout), [26] the Dutch layout uses QWERTY but has additions for the € sign, the diaresis (¨), and the braces ({ }) as well as different locations for other symbols.
File descriptor. In Unix and Unix-like computer operating systems, a file descriptor ( FD, less frequently fildes) is a process-unique identifier ( handle) for a file or other input/output resource, such as a pipe or network socket. File descriptors typically have non-negative integer values, with negative values being reserved to indicate "no ...
Unix shell. A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language, and is used by the operating system to control the execution of the system using shell scripts. [2]
Both file descriptors in a dup () system call refer to the same open file description which means they share file offset and file status flags; Similar but not identical to the logic used in pointers, shallow or deep copying or references, changes to the offset on one of the file descriptors changes it for the other file descriptor.