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diff --git a/etc/udev/udev.rules b/etc/udev/udev.rules
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+# There are a number of modifiers that are allowed to be used in the NAME or PROGRAM fields.
+# They provide the following subsitutions:
+# %n - the "kernel number" of the device.
+#      for example, 'sda3' has a "kernel number" of '3'
+# %k - the kernel name for the device.
+# %M - the kernel major number for the device
+# %m - the kernel minor number for the device
+# %b - the bus id for the device
+# %c - the return value for the CALLOUT program (note, this doesn't work within
+#      the PROGRAM field for the obvious reason.)
+# %D - use the devfs style disk name for this device.
+#      For partitions, this will result in 'part%n'
+#      If this is not a partition, it will result in 'disc'
+#
+
+# Looking for scsi bus id 42:0:0:1
+CALLOUT, BUS="scsi", PROGRAM="/bin/echo -n test-%b", ID="test-42:0:0:1", NAME="%c"
+
+# A usb camera.
+LABEL, BUS="usb", SYSFS_vendor="FUJIFILM", SYSFS_model="M100", NAME="camera%n"
+
+# USB Epson printer to be called lp_epson
+LABEL, BUS="usb", SYSFS_serial="HXOLL0012202323480", NAME="lp_epson"
+
+# USB HP printer to be called lp_hp
+LABEL, BUS="usb", SYSFS_serial="W09090207101241330", NAME="lp_hp"
+
+# sound card with PCI bus id 00:0b.0 to be the first sound card
+NUMBER, BUS="pci", ID="00:0b.0", NAME="dsp"
+
+# sound card with PCI bus id 00:07.1 to be the second sound card
+NUMBER, BUS="pci", ID="00:07.1", NAME="dsp1" 
+
+# USB mouse plugged into the third port of the first hub to be called mouse0
+TOPOLOGY, BUS="usb", PLACE="1.3", NAME="mouse0"
+
+# USB tablet plugged into the third port of the second hub to be called mouse1
+TOPOLOGY, BUS="usb", PLACE="2.3", NAME="mouse1"
+TOPOLOGY, BUS="usb", PLACE="2.4", NAME="mouse2"
+
+# ttyUSB1 should always be called visor
+REPLACE, KERNEL="ttyUSB1", NAME="visor"
+REPLACE, KERNEL="ttyUSB0", NAME="pl2303"
+
+# a devfs like way to name some tty devices
+#REPLACE, KERNEL="ttyS*", NAME="tts/%n"
+#REPLACE, KERNEL="tty*", NAME="vc/%n"
+
+