Linux › Section C · Devices › Topic C.4
udev
When you plug in a USB stick, something must set up its device file, give it sensible permissions and tell the desktop it has arrived. On Linux that something is udev, a user-space service driven by kernel events and a set of rules you can read, test and extend.
In this topic
- Why device management moved to user space
- What happens when a device appears
- Where rules live
- How a rule is written
- How the stable disk names are made
- Inspecting devices with udevadm
- Worked example: a fixed name for a serial adapter
- Watching events with udevadm monitor
- Worked example: watching a USB stick arrive
- Common mistakes to avoid
- Key takeaways
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