Original subtitles

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Let's talk a little bit about Truett and Linux there are two truths.

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There's the rich user and the root directory.

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There's also the route home but let's not talk about that for now so we don't confuse ourselves for

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now what I want to talk about is the root user and Olynyk systems particularly in Cali as well.

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By default the root use less active and you log in as the root user and as you can see here this is

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the user name that I've logged.

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And we also saw that under the power button this indicates that I'm logged in as root user and caddied.

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You can also tell that you are the root user.

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Remember when I talked about this a little bit earlier we said this indicates that you are the true

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user.

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What this means is that you are this super user that you can do anything to your system.

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This is super important for you to recognize because as a super user issuing Sundram commands could

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cause a great deal of damage and you end up having to rebuild your system from scratch sometimes.

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So be careful when issuing commands as root usually in production environments at work or at home or

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when you're connected to the Internet.

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You don't want to be running as root because anything that gets executed in your system will be executed

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as root which means it will have access to anything it wants.

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For example let's say you accidentally download a virus or malware and you execute that as a route that

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will give the virus with privileges meaning that the virus when it runs it will run as root and it will

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have unlimited unrestricted access to anything in your system.

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Well on the other hand if you log in as a regular user that does not have separate admin powers and

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you run that virus the widest might break and it might not be able to access the files that it needs

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access to.

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So because this is a super important user the first thing we want to do is change the default password.

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And the way you do that is by issuing the past WD commands I will ask you to enter and you password

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and retired then you pass it.

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Once done it tells you that the password has been updated successfully.

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I'm going to close that for now because I want to talk to you a little bit about directory structures

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now that you know what the rules user is.

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Let's see what they're with directory is and went to go to places and to computer.

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Let move this down a little bit.

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Right.

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This here where I can see everything is called the root directory and this is the main directory or

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the trunk of the tree if you will that anything else crashes out from under the directory.

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I have different factors such as the Ben EDC home and so on.

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Let's talk about those for a bit.

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The bin directory then stands for binary which means it has all the user binaries in it.

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So all the programs that I can run as a user are here including the bash the copy cat the grep and so

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on.

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All of these are commands that we're going to be looking at throughout this course the EDC directory

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is where we have the configuration files.

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So for example later on in the course we're going to be configuring the s h server so if I type.

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S-sh I can access the s h folder.

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And this is the file that we're going to be going to be getting later on.

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Are we going to be changing later on.

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The home directory is where I would have different folders for different users on the system.

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I've already created a couple of users so you can see what it looks like.

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I have two users on the system in addition to who is fluff and Tom usually these users would have their

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files and separate home directories.

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This is Tom's home.

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And this is Fluff's home the other user the Esben folder would have the system winery's.

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So we saw that bin folder which had the band that is for the user.

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These are the system winery's And these are banners that usually used to reconfigure the system or do

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things that would need root access or admin access regular users without the admin privileges will not

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be able to run these boundaries here.

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The temp as the name says will contain time for this anthem fights.

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You can use that when you're working on something Temperley that you want I know later on that you really

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don't care about.

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You just dump it and the time to get the work done and then forget about it later on you can come and

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delete it.

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And last but not least is the route home that.

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I don't know if you've noticed or you thought about this when you went to the home for the only home

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for two users.

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However we know for a fact that the system has more than two users.

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We know that the use of truth exists but there is no home here that is separate on its own and it's

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here.

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This is the home he can see the home I can on it.

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And this is where I have my documents desktop and so on.

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This folder is not accessible by other users unless they have privileges they cannot access this folder.

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So to recap what I'd like to keep in mind is a number of things.

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Number one there is the root user.

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Number two there is a root directory which has all the other directories branching out of it.

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And number three we have their word home.

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It might sound a bit confusing for now but you'll get used to it much faster than you think.

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So whenever there are scores I'm saying you just assume that this is the road user that I'm talking

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about unless I specify route home or root directory if I say to home that means I'm talking about this

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for that here.

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What has everything else under it that belongs to route documents downloads those videos and so on.

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And when I say directory that means this directory that has everything as branching out from it's again

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to use a good home and good directory that's all for the section that's moved onto the next section

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and explore together some of the most common commands that we will be using today on Linux.