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Hello, the beautiful people.

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And in this video, we're going to be wrapping up our discussion of how to navigate the Linux file system

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using the command line.

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And in this video, you're going to learn how to use tab auto completion to speed up your navigation

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of the file system.

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And we're also going to have a recap of what everything that we've learned about navigating the file

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system in the past few videos.

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By the end of this video, you're going to have all the knowledge that you need to navigate the file

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system like a pro.

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Just add practice and you're going to get plenty of that as we go through the course.

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So to get the final few pieces of information about TAB Auto completion, let's go ahead and jump right

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into it.

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Okay.

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So let's go ahead and learn about a really awesome feature known as TAB Completion.

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Now at the minute, we're currently in our home directory, as you can see, by looking at the shell

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prompt and also by using the P command, we see that we're in our home directory.

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Now we could actually jump all the way to the base directory of the system by just typing CD and then

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a slash.

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And if I do that, you'll see that if we use the print working directory command, we can see that we

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are in the base directory of our system.

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And I want to do this just to highlight that you don't have to go folder by folder when you're using

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the CD command, you can actually just jump all the way around your system.

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So for example, if I wanted to jump all the way to my desktop, I don't have to go CD then slash you

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know, I don't have to go step by step all the way through.

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I can just say CD, give it the tilde and then say because that's my home folder and then say desktop.

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Okay.

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And there we are.

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We end up in the desktop.

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So you can use the CD command to jump around.

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You don't just have to go step by step.

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Okay.

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So cleaning the screen, let's go ahead and now learn about tab completion.

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So let's say that we wanted to get all the way to my home directory using an absolute path.

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We could do that simply by just typing it all out, right?

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We could type CD, slash home, slash Ziad, and if we want to go to documents, we could type slash

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documents.

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We would be there.

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We would get all the way to the documents folder.

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But typing that out, it takes a bit of time, it's error prone and we're kind of lazy as programmers.

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So we want speed and we want things to be without errors and we want things to work right the first

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time.

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So that's where tab completion comes in.

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Let's head back to our home.

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Let's head back to the very base directory and clear the screen.

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P wd were in the base directory.

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This is how you could use tab completion to get there.

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Remember, we want to get to the documents folder.

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So that's going to be like this.

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That's where we're trying to get to.

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So let's see how we would get there.

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We type CD, then a slash.

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Now instead of typing out home, we could just type out H and press the tab and you'll see that the

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shell automatically completed that piece of text for us.

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That's pretty cool.

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Let's try and type out Ziad.

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So we just type Z and then we press tab and it's filled out my name.

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Awesome.

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Right now let's say we want to go into documents.

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Okay, let's let's try a capital D and press tab.

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Now, why isn't that working?

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Let's try again.

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Okay.

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Well, it's not working.

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Well, the reason is this Capital D could refer to lots of things in our home folder, so let's take

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a look at it.

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If we go to our home folder here, clear the screen and take a look.

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You can see that the capital D could refer to the desktop, it could refer to the downloads or it could

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refer to the documents.

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And it's the documents that we want.

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So if I if I now if I say, okay, I want to go to the capital D here and press tab twice, well, just

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press it once.

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It won't work if I press it twice, really quickly, just like that it will actually.

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It's a lot.

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It will actually let me clear the screen.

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It will press it twice.

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It will actually tell us which ones it matches.

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Okay.

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So we want to go into documents if I type doc because if I type doh and double tap, that's still no

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good because it could go for documents or download.

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So if I type doc and then press tab now it's going to go to documents and there we are, we're in the

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documents folder.

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So that's awesome.

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And it cut down our level of typing and error proneness massively.

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So if we go all the way back to the root directory now, we can just type C, D, slash tab, z, tab,

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dos tab.

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There we are in the documents folder.

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So that's really, really cool.

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This will work for file names just like it will for folders and it's amazing and I use it all the time.

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Now there's one final awesome trick.

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Let's navigate to the desktop the graphical way.

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So we're going to open, we're going to go into the goo and we're going to get to the desktop.

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Let's actually open a terminal so that the shell is operating from in this directory you can right click

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and you'll notice that you'll see an option here that says open in terminal.

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Okay.

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So if we click that, you can see that we've got a terminal that's automatically opened in the desktop.

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So say for example, you're doing stuff and you're navigating files in your I don't know, in your,

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your, your documents folder.

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We've got some files in here.

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Let's say then you could actually just right click and click open in terminal and you're directly now

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operating in your terminal from within that documents folder.

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So if you're doing stuff graphically and then you want to switch to the terminal and then switch back

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and this is a nice shortcut to be able to use.

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Okay.

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So you've learnt a whole bunch of stuff in the last three videos or so about navigating the Linux file

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system.

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So I just wanted to take a bit of time to have a quick recap of what we have learned to make sure that

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it's all sunk in so you know that you use the P command to print the current working directory that

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the shell is operating in, and it will print out an absolute path to where on the file system your

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shell is currently operating.

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You can use the RLS command to see what's around you when you are in that directory.

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It just lists out the contents of the directory.

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Folders are in blue and files are in white, but you can make that easier to see using the the capital

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F option.

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And we went through several other options that the RLS command can have to make viewing things and viewing

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files in the in the command line a lot easier.

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You saw that the CD command can be used to change directory or move to a new location on the file system.

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And you saw that absolute paths are paths that start at the very base directory of the file system.

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So the slash and relative paths are the paths that start from the directory that your shell is currently

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in.

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So relative paths are usually easier to type, but absolute paths are very clear as to where they end

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up.

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Now every directory has the dot and dot dot hidden folders that you can see using the LS command with

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the a option and the dot the one dot is four means the current folder and the two dots refer to the

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parent folder of where you currently are.

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So if you did CD and then did dot dot, that would move you up a folder because it's saying go up,

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go to the parent folder of where I currently am.

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And if you did CD Dot, then that will just basically keep you where you are.

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It wouldn't make any difference.

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Okay, now tab auto completion.

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We saw in this video and we saw that tab auto completion is a really useful technique to speed up typing

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and avoiding errors.

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And if you press tab and nothing happens, just hit tab twice really quickly and it will show you several

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options that are conflicting.

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And you can just then type out a bit more to make sure that it selects the one you want.

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So like we saw when we when we type the capital D, it wasn't working.

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But if we press tab twice, we could see that it was clashing with documents, downloads and desktop

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and then we could modify it there on to make sure tab auto completion worked.

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But you'll use Tab auto completion all the time.

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It saves you so much time and so much hassle.

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It's a great, great feature that the shell has and it can also be used anywhere, not just when navigating.

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So if you're if you are, you know, trying to enter an argument to a command and it's a file path,

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you can use tab auto completion to there as well.

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It's not just when using CD or LHS or whatever it might be.

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You can use it for pretty much any command.

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And if you want to open up a terminal where you currently are, when you're navigating graphically using

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the graphical user interface, just right click and click open in terminal and a terminal will open

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up with the current directory being exactly where you were when you opened that terminal.

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So that's a really useful feature as well.

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If you just need to make some quick edits on the terminal and then shut it again and get back to doing

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what you were graphically, it's a great, great feature, so make sure you keep a hold of that.

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So we've called a whole bunch of stuff in the last few videos and now you should start feeling comfortable

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with how to navigate.

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You just use p tab to see where you are.

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LS To look around and CD to move and in the next video we're going to start discussing file extensions

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in Linux because they don't work like they might do on other operating systems.

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And there's quite a few cool freedoms that file extensions that you have when working in Linux.

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So for that goodness, I'll see you in the next video.