udev \- Linux configurable dynamic device naming support
.SH SYNOPSIS
.BI udev " hotplug-subsystem"
+.br
+.B udev
+.RI "[-q " sysfs_path "] [-rVh]"
.SH "DESCRIPTION"
.B udev
creates or removes device node files usually located in the /dev directory.
On device removal,
.B udev
queries the internal database for the name of the device file to be deleted.
+.SH "OPTIONS"
+.B udev
+normally is called by
+.B hotplug
+with the subsystem as argument and various environment variables set.
+.br
+It may also called with the following options:
+.TP
+.B -V
+Print the version information.
+.TP
+.B -r
+Print the the
+.B udev
+root directory.
+.TP
+.BI -q " sysfs_path"
+Query with the sysfs path as argument for the name of the created device node.
+.TP
+.B -h
+Print help text.
.SH "CONFIGURATION"
All
.B udev
# udev_permissions - The name and location of the udev permission file
udev_permissions="/etc/udev/udev.permissions"
-# default_mode - set the default mode for all nodes that have no
+# default_mode - set the default mode for all nodes that have no
# explicit match in the permissions file
default_mode="0666"
.fi
where valid methods with corresponding keys are:
.TP
.B CALLOUT
-calling external program, that returns a string to match
+calling external program, that returns a string to match. The
+.B BUS
+key is optional, but if specified, the sysfs device bus must be able to be
+determined by a "device" symlink.
.br
.RB "keys: " BUS ", " PROGRAM ", " ID
.TP
.B LABEL
device label or serial number, like USB serial number, SCSI UUID or
file system label. Up to 5 different sysfs files can be checked, with
-all of the values being required in order to match the rule.
+all of the values being required in order to match the rule. The
+.B BUS
+key is optional, but if specified, the sysfs device bus must be able to be
+detemined by a "device" symlink.
.br
.RB "keys: " BUS ", " SYSFS_
.TP
The "kernel number" of the device.
for example, 'sda3' has a "kernel number" of '3'
.TP
+.B %k
+The "kernel name" for the device.
+.TP
.B %M
The kernel major number for the device.
.TP