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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 ...
In casual use, the initial step of a pipeline is often cat or echo, reading from a file or string. This can often be replaced by input indirection or a here string, and use of cat and piping rather than input redirection is known as useless use of cat. For example, the following commands:
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]
Given a command, e.g., "a | b", the shell creates a pipe, then starts both a and b with stdio for the two commands redirected so that a writes its stdout into the input of the pipe while b reads stdin from the output of the pipe. Pipes are implemented by the operating system with a certain amount of buffering so that a can write for a while ...
Pipeline (software) In software engineering, a pipeline consists of a chain of processing elements ( processes, threads, coroutines, functions, etc. ), arranged so that the output of each element is the input of the next. The concept is analogous to a physical pipeline. Usually some amount of buffering is provided between consecutive elements.
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.
cat (Unix) cat is a standard Unix utility that reads files sequentially, writing them to standard output. The name is derived from its function to (con) cat enate files (from Latin catenare, "to chain"). [ 1] [ 2] It has been ported to a number of operating systems.
Ken Thompson (designer and implementer of the original Unix operating system) modified sort in Version 5 Unix to accept "-" as representing standard input, which spread to other utilities and became a part of the operating system as a special file in Version 8.