/dev/ and hotplug management daemon
udev is a daemon which dynamically creates and removes device nodes from
/dev/, handles hotplug events and loads drivers at boot time. It replaces
the hotplug package and requires a 2.6.18 or newer kernel version.
udev - userspace device management
For more information see the files in the docs/ directory.
Integrating udev in the system has complex dependencies and differs from distro
to distro. All major distros depend on udev these days and the system may not
work without a properly installed version. The upstream udev project does not
recommend to replace a distro's udev install
How does udev work?
Short summary: when a driver is loaded it makes some information available
in /sys/ and a message is sent to udevd which reads them and creates the
This means that:
- modules cannot be loaded on demand when applications open their device,
because the device is not yet there!
- since modules are not loaded on demand, if for some reason
vol_id - probe filesystem and read label and uuid
This program is normally called from a udev rule, to provide udev with the
filesystem type of a volume and the label and uuid to name a device node.
vol_id opens the blockdevice node specified at the commandline. The following
commandline switches are supported to specify what vol_id should print:
--export export key/value pairs
udev (0.098-1) experimental; urgency=low
Starting with this release the rules files keys BUS, ID,
Frequently Asked Questions about udev
Q: What's this udev thing, and what is it trying to do?
UDEV(7) udev UDEV(7)
udev - dynamic d
ATA_ID(8) Linux Administrator's Manual ATA_ID(8)
ata_id - udev c
CDROM_ID(8) Linux Administrator's Manual CDROM_ID(8)
cdrom_id - ude
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