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[Intro Music]

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Let's briefly summarize what we

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discussed in previous lectures.

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First every process has three

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different data streams STDIN,

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STDOUT and STDERR. STDIN is

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incoming data stream, STDOUT and

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STDERR are two different

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outgoing data streams from every

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process. By default when you start

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a specific process inside of the

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shell like Z shell, or bash shell, or

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sh shell, those outgoing flows

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STDOUT and STDERR will be shown

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directly on your screen. But you're

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able to redirect those data flows

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to files, and you could even use

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different files for STDOUT and STDERR.

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Some processes also accept

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some text via STDIN. An example of

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such process is 'cat'. Next, you're

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able to concatenate different

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processes and send data from

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STDOUT from one process to STDIN of

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next process using pipe, '|' operator.

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And you could pipe multiple

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processes one by one. That's all

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for those lectures. And next, let's

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move to next subsection where we

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will talk about files

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management, and I'll explain you how

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to create new files, folders, how to

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edit contents of files and so on. I

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will see you guys in the next

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section. Bye-Bye.

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[no audio]