like label, serial number or bus device number.
These attributes are treated as a key
to determine a unique name for device file creation.
-udev maintains a database for devices present on the system.
+.B udev
+maintains a database for devices present on the system.
.br
On device removal,
.B udev
queries the internal database for the name of the device file to be deleted.
.SH "CONFIGURATION"
-udev expects its configuration at
+.B udev
+expects its configuration at
.I /etc/udev/udev.config.
The file consists of a set of lines. All empty lines and
lines beginning with a '#' will be ignored.
.br
keys: \fBBUS\fP, \fBPROGRAM\fP, \fBID\fP
.P
+The name field supports simple printf-like string subtitution:
+.RS
+.TP
+.B %n
+the "kernel number" of the device
+for example, 'sda3' has a "kernel number" of '3'
+.TP
+.B %M
+the kernel major number for the device
+.TP
+.B %m
+the kernel minor number for the device
+.TP
+.B %b
+the bus id for the device
+.RE
+.P
A sample \fIudev.conf\fP might look like this:
.sp
.nf
# ttyUSB1 should always be called pda
REPLACE, KERNEL="ttyUSB1", NAME="pda"
-# if /sbin/dev_id returns "V0815" device will be called dev0815
-CALLOUT, PROGRAM="/sbin/dev_id", BUS="pci", ID="V0815", NAME="dev0815"
+# if /sbin/scsi_id returns "OEM 0815" device will be called disk1
+CALLOUT, PROGRAM="/sbin/scsi_id" BUS="scsi", ID="OEM 0815" NAME="disk1"
+
+# USB webcams to be called webcam0, webcam1, ...
+LABEL, BUS="usb", model="WebCam Version 3", NAME="webcam%n"
.fi
.P
Permissions and ownership for the created device files may specified at
.I http://linux-hotplug.sourceforge.net/
web site.
.SH AUTHORS
-udev was developed by Greg Kroah-Hartman <greg@kroah.com> with much help from
+.B udev
+was developed by Greg Kroah-Hartman <greg@kroah.com> with much help from
Dan Stekloff <dsteklof@us.ibm.com> and many others.