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(lively music)

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- [Instructor] A couple of short challenges

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having to do with the sys file system.

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Let's just look at a little bit

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of hardware sort of information

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from the sys file system and utilities.

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From which files does lspci get its info?

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Well, we can see all the files it opens by S tracing

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and the -e and then a system call

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just shows you those system calls,

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so you don't have to wade through all the output.

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So we'll use S trace -e open at lspci,

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see which files it opens.

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Similarly, let's look in sys block for disk information.

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So you change that directory and you do an ls.

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Do you see an SDA?

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Do you see anything underneath there,

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maybe in a subdirectory about device files

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for partitions of SDA?

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And then finally using S trace with fdisk -l

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and run that as root.

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Does that open any files underneath sys block

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or underneath sys dev block?

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Give 'em a try.