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[No audio]

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Terminal commands.

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There are some terminal commands that are used

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to help you manage your terminal more efficiently.

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Now number one command that I have

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listed here is a clear command. So clear command,

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when you log into your

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terminal, you run certain commands.

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You could just simply type clear to clear your screen.

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The next command we have is the exit command.

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exit command allows you to exit

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out of session, a shell session.

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If you have gone into different shell terminals, you can

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exit out to come back to your original session.

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Or you could exit out of the terminal that you have

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opened up, or you could exit out of a user session.

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So if you have become a different user by switching

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it to, su to a different user, you can simply

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type exit to come back to your own session.

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Then the last one is the script.

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script is very helpful command.

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It's a command that stores terminal activities in a

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log file that can be named by a user.

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You could run it and you

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can name anything that you want.

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When a name is not provided by the user,

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then the default file name is used, and that

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is typescript, the name of the file.

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So let's try all these three commands

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one by one in our Linux machine.

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[No audio]

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Okay, so when you run ls -ltr, whoami,

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and bunch of other stuff,

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ls -ltr on the tmp directory, all

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that stuff that comes up.

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So you could hit enter, enter , enter, enter, enter to clear up

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your screen, or simply just type clear.

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This will clear your screen.

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And many times when people run scripts, the first

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thing they put it in the script is clear.

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So the output will clear up everything on your

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screen and then start from a new line.

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Then you have the next command is exit.

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exit is simply, when you type exit,

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it will exit out of your script,

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if there is any script it was running before.

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So I'm just going to clear that.

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So I'm going to type exit again, one more time,

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and there you go.

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It has exited out.

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I had a few scripts commands that were running

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previously, that's why I couldn't get it out earlier.

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But anyway, the last one got me out.

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So I'll open up a terminal again and this time

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I'm typing exit again to exit out of the terminal,

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because this will explain better how the exit works.

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If you become a different user, let's say su

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spider, you put in the password, now you see,

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you are logged in as spider.

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What if you want to go back into your original

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session, which is iafzal, you just type simply exit,

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and you could become back again to yourself.

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So this is what the exit command is mostly used for.

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And the last command, which I personally like, because

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it records everything that you do on your session.

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So what it does is when you run script,

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[Author typing]

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you have to specify the name I will put

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in transaction or, you know what, logfile-activity.

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.log.

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When I hit enter, it says

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Script started, file is logfile-activity.log.

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And that log file is created within

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the same directory that you are in.

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So when you run ls -ltr, you'll see at the

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end, it has created a file called logfile-activity.

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I just ran this command ls -ltr.

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This output of this command will be recorded in that.

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So if I go into another directory, let's say etc slash,

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cd /etc, run ls -ltr, clear my screen, type history command,

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or type pwd, and whatever that I am doing in

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my session, everything is recorded in my log file.

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Right now, you'll see, if I do cd, and if you go back

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to my home directory, type pwd, and I do ls -ltr,

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you see the logfile-activity, the sizes keep

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increasing because it does keep recording all the commands, and all

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the output that's coming from those commands.

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So now if I want it to be done

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with this script command, I'll just simply type exit.

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Once I do exit, it will tell me Script done,

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file is logfile-activity.log.

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It means now it is not recording anything.

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It has finished capturing the output of your session.

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Now you could view, let's clear the screen, and you

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could view the log activity, which is right here,

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when I do more on the file,

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I hit enter, and you will see,

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the first command when I ran after running

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the script command was the ls -ltr.

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It recorded the command, recorded

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the output of the command,

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keep going,

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and then I went to etc directory

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and I did ls -ltr, it recorded everythingI did.

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See all the commands, everything that I did

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while I was running the commands after the script.

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The reason that I use the script command most of

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the time is because when I am troubleshooting an issue

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or if I am creating some tools or creating some

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scripts, this would record everything for me.

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So in case a month from now or a year from now,

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and I wanted to perform the same tasks, I don't have to

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look up the commands to execute that on the terminal.

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I could just simply go into my logfile-activity,

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and I will view that and remember, oh

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yeah, these are the commands I ran, awesome.

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It's like a log book, a recording way,

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it records all your commands in a log file.

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