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+'\" t
+.TH "HWDB" "7" "" "systemd 255" "hwdb"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+hwdb \- Hardware Database
+.SH "DESCRIPTION"
+.PP
+The hardware database is a key\-value store for associating modalias\-like keys to udev\-property\-like values\&. It is used primarily by udev to add the relevant properties to matching devices, but it can also be queried directly\&.
+.SH "HARDWARE DATABASE FILES"
+.PP
+The hwdb files are read from the files located in the system hwdb directory
+/usr/lib/udev/hwdb\&.d
+and the local administration directory
+/etc/udev/hwdb\&.d\&. All hwdb files are collectively sorted and processed in lexical order, regardless of the directories in which they live\&. However, files with identical filenames replace each other\&. Files in
+/etc/
+have the highest priority and take precedence over files with the same name in
+/usr/lib/\&. This can be used to override a system\-supplied hwdb file with a local file if needed; a symlink in
+/etc/
+with the same name as a hwdb file in
+/usr/lib/, pointing to
+/dev/null, disables that hwdb file entirely\&. hwdb files must have the extension
+\&.hwdb; other extensions are ignored\&.
+.PP
+Each hwdb file contains data records consisting of matches and associated key\-value pairs\&. Every record in the hwdb starts with one or more match strings, specifying a shell glob to compare the lookup string against\&. Multiple match lines are specified in consecutive lines\&. Every match line is compared individually, and they are combined by OR\&. Every match line must start at the first character of the line\&.
+.PP
+Match patterns consist of literal characters, and shell\-style wildcards:
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+Asterisk
+"*"
+matches any number of characters
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+Question mark
+"?"
+matches a single character
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+Character list
+"[\fIchars\fR]"
+matches one of the characters
+\fIchars\fR
+listed between
+"["
+and
+"]"\&. A range may be specified as with a dash as
+"[\fIfirst\fR\-\fIlast\fR]"\&. The match may be inverted with a caret
+"[^\&...]"\&.
+.RE
+.PP
+The match lines are followed by one or more key\-value pair lines, which are recognized by a leading space character\&. The key name and value are separated by
+"="\&. An empty line signifies the end of a record\&. Lines beginning with
+"#"
+are ignored\&.
+.PP
+In case multiple records match a given lookup string, the key\-value pairs from all records are combined\&. If a key is specified multiple times, the value from the record with the highest priority is used (each key can have only a single value)\&. The priority is higher when the record is in a file that sorts later lexicographically, and in case of records in the same file, later records have higher priority\&.
+.PP
+The content of all hwdb files is read by
+\fBsystemd-hwdb\fR(8)
+and compiled to a binary database located at
+/etc/udev/hwdb\&.bin, or alternatively
+/usr/lib/udev/hwdb\&.bin
+if you want ship the compiled database in an immutable image\&. During runtime, only the binary database is used\&.
+.SH "EXAMPLES"
+.PP
+\fBExample\ \&1.\ \&General syntax of hwdb files\fR
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+# /usr/lib/udev/hwdb\&.d/example\&.hwdb
+# Comments can be placed before any records\&. This is a good spot
+# to describe what that file is used for, what kind of properties
+# it defines, and the ordering convention\&.
+
+# A record with three matches and one property
+mouse:*:name:*Trackball*:*
+mouse:*:name:*trackball*:*
+mouse:*:name:*TrackBall*:*
+ ID_INPUT_TRACKBALL=1
+
+# The rule above could be also be written in a form that
+# matches Tb, tb, TB, tB:
+mouse:*:name:*[tT]rack[bB]all*:*
+ ID_INPUT_TRACKBALL=1
+
+# A record with a single match and five properties
+mouse:usb:v046dp4041:name:Logitech MX Master:*
+ MOUSE_DPI=1000@166
+ MOUSE_WHEEL_CLICK_ANGLE=15
+ MOUSE_WHEEL_CLICK_ANGLE_HORIZONTAL=26
+ MOUSE_WHEEL_CLICK_COUNT=24
+ MOUSE_WHEEL_CLICK_COUNT_HORIZONTAL=14
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+\fBExample\ \&2.\ \&Overriding of properties\fR
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+# /usr/lib/udev/hwdb\&.d/60\-keyboard\&.hwdb
+evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer*:pn*:*
+ KEYBOARD_KEY_a1=help
+ KEYBOARD_KEY_a2=setup
+ KEYBOARD_KEY_a3=battery
+
+# Match vendor name "Acer" and any product name starting with "X123"
+evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer:pnX123*:*
+ KEYBOARD_KEY_a2=wlan
+
+# /etc/udev/hwdb\&.d/70\-keyboard\&.hwdb
+# disable wlan key on all at keyboards
+evdev:atkbd:*
+ KEYBOARD_KEY_a2=reserved
+ PROPERTY_WITH_SPACES=some string
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+If the hwdb consists of those two files, a keyboard with the lookup string
+"evdev:atkbd:dmi:bvnAcer:bvr:bdXXXXX:bd08/05/2010:svnAcer:pnX123:"
+will match all three records, and end up with the following properties:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+KEYBOARD_KEY_a1=help
+KEYBOARD_KEY_a2=reserved
+KEYBOARD_KEY_a3=battery
+PROPERTY_WITH_SPACES=some string
+.fi
+.if n \{\
+.RE
+.\}
+.SH "SEE ALSO"
+.PP
+\fBsystemd-hwdb\fR(8)