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All right.

2
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So what are we going to need?

3
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Well, to start with, I need to go to etc systemd system

4
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because I'm going to create custom configuration.

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So a lab service that is going to sleep and a lab path that

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is going to trigger the lab service.

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In order to do so, I'm going to copy from user lib systemd

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system the CUPS path.

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There's a CUPS path, and I want to have that in here,

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and I'm calling it lab.path.

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I like to work from an example.

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And let me also copy the vsftpd.service to here,

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and I'm calling it lab.service.

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Now, these are just placeholders,

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but I like to work from an example

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because then I don't get lost in the structure.

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So first, I'm taking care of my lab.service.

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And in the lab.service, we have the unit description.

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And the unit is lab sleeper.

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And after, I don't need any after.

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The type is simple.

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And we are forking, but the easiest one is simple.

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And the exec start is user bin sleep 600.

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And we don't need an install section

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because that is what the path is going to take care of.

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Good.

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Now, we are going to edit the lab.path.

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And in lab.path, description is sleeper path.

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Why do I do uppercase?

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No specific reason.

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It's part of lab.service.

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And we want it to trigger when path exists.

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And what is the path?

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Well, the path is tmp check file.

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And install wanted bias multi-user target.

36
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Yeah, that is OK.

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So this should be doing it.

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So I'm going to use systemctl enable minus minus now

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on lab.path.

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And I'm using systemctl status on lab.service.

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And we can see it is loaded, inactive, and triggered by.

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And now, I'm going to use touch on slash tmp check file.

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And I do my status on the lab.service again.

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And as you can see, it has been triggered.

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And that is how path units are working.

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Pretty cool, isn't it?