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Pipes in Unix Based Operating Systems

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linux-howto

http://linux-news.org – Unix based operating systems like Linux offer a unique approach to join two discrete commands, and generate a new command using the concept of pipe(lines). For example, consider command1|command2. Here, whatever output is generated by the first command becomes the standard input for the second command. We can develop more and more complex Unix command sequences by joining many commands while maintaining input output relationships. (HowTos)