Pipelines in Command Line Interfaces
All widely used Unix and Windows shells have a special syntax construct for the creation of pipelines. In typical usage one writes the filter commands in sequence, separated by the ASCII vertical bar character "|" (which, for this reason, is often called "pipe character"). The shell starts the processes and arranges for the necessary connections between their standard streams (including some amount of buffer storage).
Read more about this topic: Pipeline (Unix)
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“By his command these words are cut:
Cast a cold eye
On life, on death.
Horseman, pass by!”
—William Butler Yeats (1865–1939)
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