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-rw-r--r--udev.820
1 files changed, 20 insertions, 0 deletions
diff --git a/udev.8 b/udev.8
index 79b74bf659..0dacde0f5c 100644
--- a/udev.8
+++ b/udev.8
@@ -72,6 +72,23 @@ calling external program, that returns a string to match
.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
@@ -89,6 +106,9 @@ REPLACE, KERNEL="ttyUSB1", NAME="pda"
# 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