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In Linux, it's a very common practice to redirect data streams to ÖZEL processes and send some data

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to files, for example.

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And he on this diagram, you'll see some sample interaction between different processors.

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In this process, you see a study out and a study area and we redirect to a study out.

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Datastream to SDD in up Oslo process.

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This process has also, of course, a study out.

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And as to the error data streams and in this example, those are data streams sent data to specific

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file.

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And you could use even the same file for both data streams in such case as to the out.

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And as to the error, we'll write data to the same file.

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Next, you'll see that this is the area.

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Data stream redirects data to a study of an Oslo process.

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And this process sounds as to the error results to a NAS or a file.

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Also, you'll see that a study out of this process does not send data to Oslo process or to us or file.

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And that means that if this process is running inside of specific, biased or CHL, then you'll see

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a result of this.

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As to the out data stream inside of the terminal where you are running best or S.H. process.

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Now let me jump into the terminal and explain you all of that unpracticed.

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Let me clear terminal here and I'll use first cart comment.

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Got comment allows you to read the contents of a specific file or read contents from SDD in.

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And that's actually throws you did that.

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I am showing you in discourse that allows you to read data from SDD in.

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I mean, you are able to send data to the end of this process and this process will accept this data

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and process it.

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All right.

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Let's go back to terminal.

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And first, let's have a look at the help for this come.

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Let me scroll up a bit.

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And here you'll see that this comment actually conquered the nades file or files and sends data to standout

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output.

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With file, because you see that the file is actually optional argument.

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This OHDELA Day opportunity will read data from standout input.

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Let's try it.

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Let's try this, what do we do without any argument?

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Simply cut breast cancer and no, I see that this process is running.

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If I enter and also tap and if we believe have a look at protesters around and instead of this container

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dogor exactly this idea, let me copy this container idea based here.

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And I could simply type here.

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P.

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S.

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And this will start to be as broad as inside of the run container.

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Let's press enter.

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Actually, I need to add to your option because Sandesh e I want to see all processes and yes.

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Now I see here got proses.

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The discount click on it.

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And here this is brought this idea great here.

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While this process is running, we are able to send some data to SDD in off this process with type.

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Hello.

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Got like soul enter and I see result.

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And that means that Hillo Cut was sent as a study in datastream to got process and it has sent it back

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via a study out datastream.

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And that's why we have seen this line in the terminal.

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Notice that if I press simply anthurium, I get actually do empty lines.

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And that means that this answer is also written back by Estin, the out data stream of coprolites.

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Let's type something.

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Singles.

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Hi.

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Hey.

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Good morning.

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And so on that scale, you're able to interact with SDD in data stream of specific process.

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All right.

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Let me terminate this process.

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Control, see?

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Now, it was terminated.

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And if I least protest us now, the S I don't see God brought us here on the list.

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It was stopped.

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But that was example of the process that has ESTA in open and you could send data via this as to the

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data stream and it sends the same data back via a study out datastream.

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All right, if I use the same command.

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But with argument, let's have a look at the contents of this folder.

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And here I still see two different files as to the error, the takes.

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And as to the LDA takes steam.

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I could actually read them using got comment, got the name of the file.

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A study out of the extreme.

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I'll see actually contents of as LDA takes the file.

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But this file is empty.

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Let me read the contents of a study error file.

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And there was this text to present.

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And this text was produced by a study out Datastream of God Brought US.

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And if you'll supply file name as argument for God comment, you are not able to send any additional

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text via a study in datastream to court process.

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And the reason for that is that this file is actually streamed to the in of God process.

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That's how it works under the hood.

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But a study out is right, the right of girls to parent process and burn notice in this case is best

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show.

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All right, now, let me demonstrate to that.

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Avery datastream a study in a study out and study error has numeric ideas.

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Let me enter full increment.

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Cut.

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Zero.

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Less than sine and SDD error.

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The extreme enter.

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And I get same result as before.

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And actually, in this comment, I have told that I want to send as to the Arabic text defile via standout

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in to Qatar process.

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And actually this combination zero allows them tells that zero is ideal of SDD in datastream.

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One is idea of a study.

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Our data stream and two is idea of a study.

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Our data stream.

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Let me show you that.

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Let me clear terminal.

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And let me remove actually those two files are M.

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S DDA error that the extreme and our M is to the outdoor deal.

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Now, those files are absent.

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Right.

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Let me clear terminal.

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And here again, I'll use Alaska amend.

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It will start this process.

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And I want as to the old data stream of this protest to be sent to file.

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And as to the air date approaches, I'll send to annuls or file for that.

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I could use a numeric I.D. of data streams.

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Zero work app is I.D. of SDD.

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In one is I.D. of a study out and using SISA index one greater than sign without space, please.

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I could send as to the our data stream to specific file.

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Or if you want to Oslo process, I'll send you the file.

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A study out dodig steam.

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Next comes SpaceX and he'll we'll be to greater than site do is iodine up as to the air datastream and

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I'll send it to Amar's or file SDD our dot x2 like so.

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With this comment, I will redirect bulls as to the out.

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And as to the air data streams of L'Esperance, that's press enter.

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And of course, I see nothing here in the terminal because as the day out was redirected to the file

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and here I should see two newly created files as to the outtakes.

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And as to the error, the digs deep.

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And of course, you could guess that.

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As to the Arab street is empty.

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And as to the outtakes 60 complains list of folders Dorce folders.

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Let's have a look at as to the outtakes team God, SDD out of the extreme.

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Here are those folders and let's have a look at the esta dia error, Detective.

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It is empty.

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All right.

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But if I repeat same comment about Wills and Kate D, I process.

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Let me do that.

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I don't see that as Dedede error.

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The text file now contains this error that was produced by this process and sent via ethe as to D error

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datastream.

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And please note again that this too is numeric I.D. of SDD error datastream.

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One is idea of SDD out datastream.

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Also, please notice that was greater than sine we create those files.

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This one and this one.

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Each time from scratch we rewrite previous file.

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If you want to append data to the file, you could use two arrows instead of one.

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Let me show you that here.

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Real beom rather than sine like so.

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And here will be one more sign as well.

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Press enter and less with contents of our file.

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Once again.

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And now we see that this text was appended to this text.

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Also, let's repeat the same comment about the let's for example, instead of mce d i r let's use got

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command and let's send also argument to this command and this argument will be name of the file that

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is absent.

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Now in this folder where we are on in cut command and in such case when file is absent, God will produce

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an error.

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And let's see which area it will produce.

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Let's hear type for example, absent file the D like so and this syntax will remain in place.

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Let's press enter and let's with contents of SDD out the text file.

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And I see that this new line appeared here in this text file.

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Absent father takes D.

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No such file or directory and that is a result of this command.

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This file Epson file of 60 is absent.

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Here it is.

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You don't see this file here in this folder.

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This white card command has produced this error and it has sent this error by as to the error datastream

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to this file and using two arrows.

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We actually have append that contents to existing file.

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That's why those lines still present here in this file.

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And this line was appended like so.

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All right, guys, this code you are able to read direct data streams from a specific brought us.

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And you could send out those dreams, eyes or files, as we have tried in this lecture or to Oslo processes.

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And if you want to send the data from one process to ad nauseum, it is called biting.

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And let me demonstrate how to perform Bipin in the next lecture.

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I'll see you down.

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Bye.