Name
systemd-hwdb — hardware database management tool
Synopsis
systemd-hwdb [options] update 
systemd-hwdb [options] query modalias 
Description
systemd-hwdb expects a command and command
    specific arguments.  It manages the binary hardware database.
Options
--usrGenerate in /usr/lib/udev instead of /etc/udev.
-r, --root=PATHAlternate root path in the filesystem.
-s, --strictWhen updating, return non-zero exit value on any parsing error.
-h, --helpPrint a short help text and exit.
    
systemd-hwdb
      [options]
      update
Update the binary database.
systemd-hwdb
      [options]
      query
       [MODALIAS]
    
Query database and print result.