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Okey-dokey, at this point in time, you should have Python installed already,

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and it's now time for a quick lesson on some command line

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basics. So if you are on a Mac, there's a program called

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'Terminal', and pretty much every Mac comes with this, and

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you can find it by hitting command space, and then just typing

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'terminal.app', or just 'terminal', and then go to 'Terminal'

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app. And that will open up your command line program for

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you. If you're on Windows, you'll probably have a program

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called 'cmd', or 'PowerShell', or you can download one called

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'Commander', 'Cmder',

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and that will be a command line program that you'll use for

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the rest of the course as well.

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If you're on Linux, there's a program called Bash, but there's

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also a ton of other programs out there that you can install.

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Likewise for Windows and Mac OS as well.

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So really, if you don't want to use what's already on your

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computer, and every computer will come with a command line

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program, you can download and install a different program.

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Okay, so I've just zoomed in on my terminal here so you can see what's going on.

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And for a quick little command line crash course, there's

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a few things you're going to need to know.

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You need to know how to list files in a directory.

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So on Unix based systems,

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so Linux and Mac, you can usually type 'ls -la', and it will

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show you all sorts of things in here.

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You can see I've already got a Fuller called 'Python_for_Everybody'.

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Where's the one that I want to go into?

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Let's go into 'Movies'.

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So, let's say I can see that there's a folder in there called

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'Movies' that I want to get into it.

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I can type 'cd', and then the name of the folder, and now I'm inside of it.

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And most programs will also tell you which directory you're in as well.

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A directory is a folder, by the way, if you did not know that.

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Now just going back a quick sec,

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I did the example of 'ls -la'.

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If you are on Windows, your command is going to be different.

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It's going to be 'd-i-r', 'dir', and 'dir' will show you all of your

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files and folders the same way that 'ls -la' does for me.

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So let's 'cd' into a directory called 'Movies', that's just change

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directory. You can use this on all operating systems.

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'cd' just means change

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directories. 'pwd' will show you exactly what directory you're

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in. So I'm in the 'Users' directory,

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'kalobtaulien/Movies'.

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If you're on Windows, this is going to look a little different.

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It's going to say something like 'C:\' drive,

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I can't remember exactly what it is,

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'Users', that would be

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'kalobtaulien/Movies' something along those lines.

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Anyway, that's what you'll see on Windows. And on Linux

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it might actually just look like '/home/kalobtaulien/Movies,

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I don't know, something like that.

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So that's how you see where you currently are, it's 'pwd'.

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Now let's say you wanted to make a directory, and this is

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going to be important eventually down the road.

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So if I do 'ls -la' or 'dir' on Windows, I can see that I have

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a few files in here.

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None of them are really important.

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If I wanted to make a new directory, I could do 'mkdir',

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that stands for 'Make Directory', and let's call it 'TestDir'.

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'ls -la' or 'dir' on Windows,

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and you can see that there is a new directory in here,

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and I can change directories into there, and do 'pwd'.

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[no audio]

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Now if you are in a directory, and you want to move out of

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it, you can always do 'cd ../', and that will move

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you up a directory.

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You can do it again.

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'cd ../', moves you up a directory. And if you ever wanted to move

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into multiple directories, you could do 'cd Movies', and then

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whatever the other directory is, or a subfolder, or a subdirectory.

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And for a lot of cases you can just usually type most of

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the word hit tab and it will autocomplete for you.

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So 'cd Movies/TestDir'

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I moved into two folders at the same time there. 'cd ..

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/../' will bring me out of 'TestDir',

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out of 'Movies', and back into my main location, which for me is 'Users

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/kalobtaulien'. One last one you're going to need to know is

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'python'. 'python' is a command.

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Let me clear this out as well.

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Python is a command you're going to need to run.

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And it's probably a good idea to try to figure out what version

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of Python you have right now by typing 'python -V', and

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you can see I'm using Python 3.7.2.

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You might be using Python 3.7, 3.8, 3.9, something newer.

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If you see,

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Yeah, if you see Python 2.7., something, or other, without

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having to type 'python2',

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if it just shows this in here when you run this command,

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that could be a problem.

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So for me I just need to type 'python', and it assumes Python

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3. If your computer is not assuming Python 3, you

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might have to type 'python3 -V',

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and you can actually see because I'm using multiple versions of Python,

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if I use 'python3' instead of just the word 'python', it

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uses Python 3.8.

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And again, that's just because I have multiple versions of

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Python on my computer.

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There's also another way if you have Python 3.7, you could

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do 'python3.7 -V', and it'll show you,

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and I don't even know if I have Python 3.6 on here anymore.

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Turns out I don't, but I could install with 'pyenv'.

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That's something we can talk about down the road is multiple

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versions. But the thing to take away here is if 'python -V' says

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Python 2., something or other you might want to try

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'python3 -V', and moving forward you're going to want

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to use 'python3 yourfile.py'. We'll talk about that

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again in the future lesson, but that's just something to

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be aware of on the command line as well.