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rules file you normally define only symlinks, using SYMLINK fields alone, as described in the following sections These set up symbolic links to devices, letting you access them with other device names NAME fields are used to create the original device interface, a task usually left to udev itself Each line maps a device attribute to a device name, as well as specifying any symbolic names (links) Attributes are specified using keys, of which there may be more than one If all the keys match a device, then the associated name is used for it and a device file of that name will be generated An assignable key, like NAME for the device name or SYMLINK for a symbolic name, is use to assign the matched value Instead of listing a device name, a program or script may be specified instead to generate the name This is often the case for DVD/CDROM devices, where the device name could be a dvdwriter, cdwriter, cdrom, or dvdrom The rules consist of a comma-separated list of fields A field consists of a matching or assignable key The matching keys use the == and != operators to compare for equality and inequality The *, , and [] operators can match any characters, any single character, or a class of characters, just as in the shell The assignble keys can use the =, +=, and := operators to assign values The = operator assigns a single value, the += appends the value to those already assigned, and the := operator makes an assignment final, preventing later changes The assignable keys also support the udev keys listed in Table 31-3 Check the udev Man page for detailed descriptions The key fields such as KERNEL support pattern matching to specify collections of devices For example, mouse* will match all devices beginning with the pattern mouse The following field uses the KERNEL key to match on all mouse devices as listed by the kernel:
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KERNEL=="mouse*"
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The next key will match on all printer devices numbered lp0 through lp9 It uses brackets to specify a range of numbers or characters, in this case 0 through 9, [0-9]:
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KERNEL=="lp[0-9]*"
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The NAME, SYMLINK, and PROGRAM fields support string substitution codes similar to the way print codes work Such a code is preceded by a % symbol The code allows several possible devices and names to be referenced in the same rule Table 31-4 lists the supported codes The udev Man page provides many examples of udev rules using various fields The 50-udevrules and 20-namesrules files hold rules that primarily use KERNEL keys to designate devices The KERNEL key is followed by either a NAME key to specify the device filename or a SYMLINK key to set up a symbolic link for a device file The following rule uses the KERNEL key to match on all mouse devices as listed by the kernel Corresponding device names are placed in the /dev/input directory, and the name used is the kernel name for the device (%k):
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KERNEL=="mouse*", NAME="input/%k"
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This rule uses both a BUS key and a KERNEL key to set up device files for USB printers, whose kernel names will be used to create device files in /dev/usb:
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BUS=="usb", KERNEL=="lp[0-9]*", NAME="usb/%k"
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Devices and Modules
Matching Keys ACTION DEVPATH ENV{key} BUS DRIVER ID KERNEL PROGRAM
Description Match the event action Match the device path Match an environment variable value Match the bus type of the device (The sysfs device bus must be able to be determined by a "device" symlink) Match the device driver name Match the device number on the bus, for instance, the PCI bus ID Match the kernel device name Use an external program to determine the device This key is valid if the program returns successful The string returned by the program may be additionally matched with the RESULT key Match the returned string of the last PROGRAM call This key may be used in any following rule after a PROGRAM call Match the device subsystem Match the sysfs device attribute, for instance, a label, vendor, USB serial number, SCSI UUID, or file system label Description The name of the node to be created, or the name the network interface should be renamed to The permissions for the device Match the location on the bus, such as the physical port of a USB device Export variable to environment Import results of a program, contents of a text file, or stored keys in a parent device The type can be program, file, or parent The name of the symbolic link (symlink) for the device Add program to list of programs to be run by device
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