Receive device add and remove uevents from the kernel.
Use a user-space mechanism to apply rules for names, permissions, and additional actions.
Which component is appropriate?
udev receives kernel device events and applies rules to manage names, permissions, symlinks, and helper actions.
Detailed explanation
Correct. udev processes device events and applies udev rules.
Correct. udev processes device events and applies udev rules.
Incorrect. GRUB is a boot loader.
Incorrect. GRUB is a boot loader.
Incorrect. cron schedules time-based jobs.
Incorrect. cron schedules time-based jobs.
Incorrect. syslog handles logging, not device-event rules.
Incorrect. syslog handles logging, not device-event rules.
Try it yourself
An example you can run in a temporary verification environment.
udevadm --versionExpected result
利用中のudev実装のバージョン番号Key points
- uevents originate in the kernel
- udev runs in user space
- Rules apply actions based on device attributes
Notes
- Environment: Linux / systemd-udev 255以降
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.