| (Pipe): Communicates between Processes
Because pipes are integral to the functioning of a GNU/Linux system they are introduced here for use in examples, Pipes are covered in detail in on page 151.
A process is either the means by which GNU/Linux executes a utility or other program or is the utility/program as GNU/Linux executes it (page 142). Communication between processes is one of the hallmarks of UNIX/Linux. A pipe (written as a vertical bar, |, on the command line and appearing as a solid or broken vertical line on keyboards) provides the simplest form of this kind of communication. Simply put, a pipe takes the output of one utility and sends that output as input to another utility. Using UNIX/Linux terminology, a pipe takes standard output ...
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