All
.B udev
configuration files consist of a set of lines of text. All empty
-lines and lines beginning with a '#' will be ignored.
+lines or lines beginning with '#' will be ignored.
.P
.B udev
.IR /etc/udev/permissions.d/ .
.TP
.B udev_log
-The switch, if udev logs some information for every device handled.
+The switch to enable/disable logging of udev information
The default value is
.IR yes .
.TP
.B default_mode
-The default mode for all nodes not explicitely matching in the permissions
+The default mode for all nodes not explicitly matching in the permissions
file. The default value is
.IR 0666 .
.TP
.B default_owner
-The default owner for all nodes not explicitely matching in the permissions
+The default owner for all nodes not explicitly matching in the permissions
file. The default value is
.IR root .
.TP
.B default_group
-The default group for all nodes not explicitely matching in the permissions
+The default group for all nodes not explicitly matching in the permissions
file. The default value is
.IR root .
.br
udev_log="yes"
# default_mode - set the default mode for all nodes not
-# explicitely matching in the permissions file
+# explicitly matching in the permissions file
default_mode="0666"
# default_owner - set the default owner for all nodes not
-# explicitely matching in the permissions file
+# explicitly matching in the permissions file
default_owner="root"
# default_group - set the default group for all nodes not
-# explicitely matching in the permissions file
+# explicitly matching in the permissions file
default_group="root"
.fi
.P
-The rules for device naming, are read from the files located in the
+The rules for device naming are read from the files located in the
.I /etc/udev/rules.d/
directory, or at the location specified by the
.I udev_rules
specified by separating the names by the space character.
.br
If both the name and the symlink fields are omitted or its
-values empty, the device will be ignored and no node will be created.
+values are empty, the device will be ignored and no node will be created.
.br
If only the symlink field is given and the name field is omitted,
-the rule will not be applied immediatly, but the symlink field is added
+the rule will not be applied immediately, but the symlink field is added
to the symlink list of the rule which will create the node.
This makes it possible to specify additional symlinks in a possibly
separate rules file, while the device nodes are maintained by the
given in the permissions file.
.P
.RB "The " NAME " ," SYMLINK " and " PROGRAM
-fields support simple printf-like string substitution:
+fields support simple printf-like string substitutions:
.TP
.B %n
The "kernel number" of the device.
The bus id for the device.
.TP
.B %c
-The string returned from the execution of
+The string returned by the external program, specified in
.B PROGRAM
(This does not work within the
.B PROGRAM
.RI "A sample " udev.rules " might look like this:"
.sp
.nf
-# if /sbin/scsi_id returns "OEM 0815" device will be called disk1
+# if /sbin/scsi_id returns "OEM 0815", the device will be called disk1
BUS="scsi", PROGRAM="/sbin/scsi_id", RESULT="OEM 0815", NAME="disk1"
# USB printer to be called lp_color
.fi
.P
-The permissions and ownership of the created device file is read from
+The permissions and ownership of the created device file are read from
the files located in the
.I /etc/udev/permissions.d/
directory, or at the location specified by the
pattern string "tty[SR]" would match either "ttyS" or "ttyR". Ranges are also
supported within this match with the '\-' character. For example, to match on
the range of all digits, the pattern [0\-9] would be used. If the first character
-following the '[' is a '!', any character not enclosed is matched.
+following the '[' is a '!', any characters not enclosed are matched.
.P
After device node creation, removal, or network device renaming,
.B udev
executes the programs in the directory tree under
.IR /etc/dev.d/ .
-The name of a program must end with
+The name of a program must have the suffix
.I .dev
-suffix, to be recognized.
+to be recognized.
.br
In addition to the hotplug environment variables,
.B UDEV_LOG