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(lively music)

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- [Instructor] Let's look at a couple of challenges

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for loadable kernel module files.

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So remember when we're working loadable modules in general,

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you got to be careful,

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especially when you're writing your own,

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and we'll do that later on.

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So overall, it's best if you're using

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some sort of machine like a VM that if you corrupt it,

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it's not a catastrophe.

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All right, so couple of questions.

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How many modules are installed on your system?

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That is, how many of these .kozst files

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are there for your kernel version?

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And then also, right, the modules are going to be

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underneath lib modules, your kernel version,

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and you can get your kernel version

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with uname space -r.

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And if you haven't seen it before, $ open paren

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and then a command

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runs that command and takes the output

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and sticks it back on the command line.

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So lib modules/$(uname -r) is a handy way

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of getting to the lib modules directory

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for your running kernel.

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So in that directory you'll see sub directories

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and all the modules are under there somewhere,

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but at the top level you'll see a number of files,

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including a file called modules.dep.

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We'll look more at that later, but right now,

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count how many lines are in that

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and then we'll talk about it.