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All right.
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So now that you've got Node and Hyper installed, it's time to check it out and see what we can do
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using Node.js.
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So the first thing I'm going to do is I'm going to create a new folder on my desktop.
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But this time I'm going to do it slightly differently.
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I'm going to be using our brand new Hyper Terminal, and we can issue it commands in order to get it to
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do what we want.
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So the first thing I'm going to type is pwd,
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and this stands for print working directory,
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so print where we are currently. Now working with the command line involves a little bit of imagination.
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You have to be able to imagine where you are in this giant filing cabinet.
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So, for example, you might have a cabinet and it has three drawers. Inside the first drawer
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there might be three folders. Inside the first folder
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there might be another three folders.
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So this is how directories work on your computer.
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And we're going to go into this in a lot more detail in the next module, where we explore everything
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that we can do using the command line.
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But here's a little bit of a taster, or a sneak peek, of the fun things that are yet to come.
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So by using the pwd command and hitting enter,
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we get printed out a number of lines that shows us where we are in this giant filing cabinet.
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So the starting point is called the root,
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and then we're inside a folder called Users,
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and inside that folder there's another folder called angelayu.
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So if you're used to a graphical interface, this is basically where we are. We’re inside this current folder,
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and you can see that the folder above it is called Users,
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and then if I double click on this folder called angelayu, then I get into my home folder, and from here
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you can see that we have our Desktop folder.
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So in order to move over there, then all I have to do is write cd, which is the command, and it stands for
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change directory, or change folders, and we're going to change over to Desktop.
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Now you can either type it out entirely, so Desktop. I don’t know why I just turned
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Japanese just now. Or you can simply start writing, say De, and then you can hit the tab in order for
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it to auto complete.
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Now, for example, if you only wrote the word D and you have multiple items like Documents, Downloads, Desktop,
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then it won't know what to suggest, so it won't come up with anything.
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But if you give it enough characters for it to be able to identify a unique name, then hitting that tab key
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will auto fill the rest of it.
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So now, if I hit enter, I am now inside the Desktop folder. As you can see, that's what's showing up. At
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the colon is our current location. And we can confirm that with the full directory path by using pwd. You can see
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that we're inside Desktop, which is inside angelayu, which is inside Users.
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Now once we're on to the Desktop, so I'm going to do it side by side with Finder over here as well,
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now once we're inside Desktop, we can use a command called ls which simply just lists everything that
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currently exists inside our location.
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So now we can see what exists here.
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And we've got something called Web Development, something called App Development, two folders.
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Now, if I wanted to make a new folder at this current location, Desktop, all I have to do is write the
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command make dir, or mkdir, and this makes a new directory, or rather new folder.
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It's the equivalent of hitting right click and clicking on New Folder.
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And then we have to specify the name of the folder, and I'm going to call mine intro-to-node.
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So you can have it capitalized if you want, but I'm just going to keep it lower caps
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and also with hyphens in between.
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And now, if I hit enter, I have a new folder called intro-to-node.
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Cool, right? Now, if you haven’t used command line before,
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it really is built for power users, because we can do so much stuff that Apple or Windows has kept
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away from us.
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And I think using the graphical interface is kind of like riding a bicycle with training wheels.
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This is more like a full blown Hayabusa motorcycle. With great power comes great responsibility, and
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we're going to talk a lot more about that in the command line module that's yet to come.
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But now that we've created our folder called intro-to-node, I'm going to then cd, or change directory, into
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that folder.
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And now I am inside this location,
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so the equivalent of being here.
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And if I hit ls here you can see that there's nothing.
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It's completely empty so far.
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So we're going to create a new file here, and the command for creating new files is touch.
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So we're going to say touch and then we're going to specify the name of the file.
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So we're going to say touch index.js.
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And now, if I hit enter, you can see, wow, brand new file that's just been created out of mid air.
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So if we double click on this, it should open up in Atom. If it doesn't,
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then make sure you right click and tell it where to open to, which is Atom.
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And inside this file, we’re going to simply create a console.log that just says, “Hello, world!”
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Up till now, we've only been able to run this code if we incorporated it into an HTML file and opened
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it inside our browser.
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But now we're going to do something slightly crazy.
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We're going to run this code using our computer, and we can do that by simply being inside the folder
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where that file exists,
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so when I hit ls I should be able to see the file that I want to run, and then I'm going to use the
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command node index.js. 
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So this says use Node to run this file.
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And now, if I hit enter, you can see that the result of that file, which was simply to console.log “Hello,
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world!”, gets executed, and it gets logged inside my Hyper Terminal.
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So that was our first Node.js file that we executed.
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Now, in the next lesson, I want to talk to you about the REPL, the Read Evaluation Print Loop.
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So for all of that and more, I’ll see you on the next lesson.