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In this demonstration,

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we're going to walk through the process

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of installing and configuring a Linux module.

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A kernel module is a system level object

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that extends the functionality of the kernel.

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It can be dynamically loaded into the kernel

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or unloaded from the kernel as required.

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Also modules allow the kernel to update

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without requiring a system to reboot.

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Now, some of the advantage

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of kernel modules are they reduce the burden of the kernel

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because otherwise all of the modules' functionality

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will have to be included directly into the kernel.

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It also allows us to dynamically load the modules.

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So that means there's a lot less memory consumption.

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So for this example, we're just going to walk

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through how to install a basic Bluetooth module

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into the kernel so we can get that Bluetooth functionality.

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So the first thing we want to do,

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we're going to list out the current running modules.

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Okay?

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I'm make it less.

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So let's scroll through this.

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Now we see this is what's currently running

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as a Linux module on our current system.

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Typically, when you're looking

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for something in these vas files

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we're going to pipe it with the grip command.

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We learned that earlier.

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So we're going to let's

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we're going to pipe it with the grip command.

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See if we can find anything related to a Bluetooth.

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Okay. Seems like there has no results there.

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These names, aren't always going to have a alias

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exactly how we like them.

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We're going to walk through later how to actually

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configure a file to change the alias for future references

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or anyone else that's using these machines.

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So we can easily group categorize

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and search different modules based on their functionality.

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So first we're going to use the you name command.

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That's going to have us retrieve the exact version

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of the kernel that we're currently running.

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Now, at this point, this one

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we'll start doing some research

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probably a quick Google search.

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You know, some things that are compatible

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with this particular version of Linux.

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Now for this Bluetooth functionality

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we're just really looking for the driver.

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And so there's a special folder for this in Linux.

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So we're going to go to the library.

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I'm going to look at the modules, okay.

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And they want to use the kernel that we currently have, right?

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Remember tab through kernel drivers.

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Now in this particular folder, we're going to look

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and see if they have anything relative to Bluetooth.

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So we see there's a folder here that should have

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the modules slash drivers that we're looking

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for relative to Bluetooth.

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So we're going to go

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into this folder and we're going to list it out.

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We're going to see what we have here.

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They're trying to best to name 'em as close

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to possible as some of their functionality.

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So we're trying to use in this example

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a Bluetooth that's attached to a USB device.

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So BT USB is close enough to get us kind of

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know where we need to be, but again

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we're going to need more research, but for this example

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that's going to be the correct one.

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So we're going to go over the mod info command,

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which pretty much just lists out a lot of the information

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about the particular device that we're trying to use.

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That's okay.

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I'm going to do here T USB.

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All right.

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And so we see this, some of the key points, right?

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It's no version, aliases, in the description.

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This is just a generic Bluetooth USB driver.

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Now what's important when we're installing modules

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is understanding that a lot

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of modules are dependent upon other modules.

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So we're going to have to update this file and we're going to do

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that by using a sudo dependency module command

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but updates the system.

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Cause we're going to use this mod probe command.

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So now we have an accurate representation

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of which modules depend on which other modules.

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Now we're going to walk through

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how to configure a alias for that module.

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So we see earlier that we went through and we saw the name

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and it, the alias is for that Bluetooth device.

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If we want to go back to this command,

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we see it wasn't that helpful.

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So we're going to create alias ourself

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but we first have to CD to the etc mod pro directory.

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Okay, and go there.

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Now within this folder,

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this is where we're going to create the aliases.

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All right.

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So this file is already in here.

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I created for us earlier.

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So simply all we have to do to make this alias

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is type alias.

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The next field is going to be what we want to name it.

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And the third field is going to be the name

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of the actual driver

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or module that we're creating an alias for.

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So again, alias to let the file know that,

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"Hey we're referring to the, alias of this blue,

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so that we're going to call it BTUSB is the name

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of the actual module that we're going to be referencing.

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So let's quit out of this.

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All right.

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So next we're going to do is go ahead

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and add slash install this module.

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Remember we created alias, we named it blue

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and we see a command went through successfully.

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Now we're going to list out this mod

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and we're going to search for it using our grep search tool.

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And we're going to look for anything relative to BTUSB.

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And we can now see that this module is currently running.

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Now, if you look, that's a few other modules that are

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running now, remember we searched earlier for Bluetooth.

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We couldn't see any, but now we see a Bluetooth module

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is currently running, but you have to realize

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remember when we did the update to the dependencies

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it automatically installed for us with

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the mod probe command.

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Now the other commands that you can use to install modules.

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So a couple of 'em are the insert mod.

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So insmod or the remove mod, rmmod

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the reason most people use the mod probe is

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because it allows us to do both, but it also simultaneously

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installs the dependencies that are necessary

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for the particular device to function.

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In this walkthrough.

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We went over the benefits of the kernel modules.

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We went over how to install a Bluetooth driver slash module.

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We discovered how to search some

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of the files and the locations that some

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of the information will be and how to update the aliases.

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And also the dependency table.

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That's going to be required when we use our, my pro command.

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And I'll see you

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in the next one.