Original subtitles

Okay.

So from the previous lectures, we know how to change the Mac address using these three commands by

doing if config lan zero down if config lan zero whether followed by the MAC address that we want to

change our MAC address to and then we do if config lan zero up to enable our interface.

We also learned how to execute system commands from Python using the SAP process module.

So we're going to combine these two things and write a program that will change the Mac address for

us.

So first of all, I'm just going to close this from here and then all we have to do right now is change

if config in here with the commands that we executed here.

So the first command that we want to run is going to be if config.

Land zero down.

Then you can actually do control DX to duplicate the line that you're currently at.

So I'm going to do Control D right here.

And as you can see, I have a new line exactly similar to the previous line.

And in here we're going to do if config line 0hw ether and then input the MAC address and let's set

it this time to zero zero.

One, one, two, two, three, three, four, four, and we'll set it to six, six this time so we

can differentiate it from the previous one.

And finally, I'm going to do Control DX again because I'm lazy.

So a duplicates the line for me.

And the final command is going to be if config lan zero up to enable the interface and that's it.

We're done.

Very, very simple.

So very similar to what we did before.

We're importing this process module first and then we're using the same function, which is the call

function which allows us to run system commands and we're on Linux so we can run any Linux commands.

And we know that these commands allow us to change the Mac address.

We put the interface down first, then we set the MAC address that we want to use by doing if config

lan zero hash table other followed by the mac address.

And then we do if config lan zero up to enable the MAC address.

Now if we execute this script from terminal, the script should change the MAC address for us and we

won't have to run these three commands to do it.

So I can run it by going to run here and then run.

But I actually don't want to do that.

I want to run it from terminal because I actually like running stuff from terminal more because I can

run other commands and so that we can run if config after it and make sure that the MAC address did

actually change.

So I'm going to go to my terminal and I'm going to navigate to where this project is stored.

Now, if we go up here just for a second and hover over here, you can see that this project is stored

in my user home.

PY Charm mac changer.

So I'm going to do see the pie chart projects and by the way you can just press tab as you're typing

a command and it will autocomplete for you.

So all I have to do is type Mac and Tab and as you can see, it automatically auto completes the mac

changer.

Now, if I do, LZ, here to list all the files you can see, I have my mac changer script in here.

And to run this script, as usual, all you have to do is do python mac.

Change your dot py hit enter.

And this didn't show us any errors.

So this is very good.

This means that things did actually work.

And now if we do if config lands zero.

You can see that our Mac address got changed to 001122334466 instead of five five.

So this means that our code in here worked and we managed to execute these three system commands through

our Python script.

Now I know what you're thinking.

This is very simple.

All we're doing is just running system commands.

Doesn't really show the power of Python, but we're still at the very start of the lectures.

I'm actually going to spend a little bit more time on this script to cover a lot of basics about Python

programming.

So in the next lectures, we're going to be building up on this very simple script.

And as we do that, I'm going to teach you conditional statements, variables, regex and more.

And this is the style I'm going to follow throughout the whole course.

We're going to be, first of all, creating a script that does something useful, and then we'll build

up on that.

So this won't be the only script that we create, but we're actually spent some time working and adding

features to this script because as I add features, I want to cover Python basics so that I can teach

you more advanced Python programming in the next sections and build more advanced Python programs.