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xdg-open是xorg调用程序的接口，你man xdg-open就明白了
XDG-OPEN(1)                                              xdg-open Manual                                             XDG-OPEN(1)

NAME
       xdg-open - opens a file or URL in the user's preferred application

SYNOPSIS
       xdg-open {file | URL}

       xdg-open {--help | --manual | --version}

DESCRIPTION
       xdg-open opens a file or URL in the user's preferred application. If a URL is provided the URL will be opened in the
       user's preferred web browser. If a file is provided the file will be opened in the preferred application for files of
       that type. xdg-open supports file, ftp, http and https URLs.

       xdg-open is for use inside a desktop session only. It is not recommended to use xdg-open as root.

OPTIONS
       --help
           Show command synopsis.

       --manual
           Show this manual page.

       --version
           Show the xdg-utils version information.

EXIT CODES
       An exit code of 0 indicates success while a non-zero exit code indicates failure. The following failure codes can be
       returned:

       1
           Error in command line syntax.

       2
           One of the files passed on the command line did not exist.

       3
           A required tool could not be found.

       4
           The action failed.

SEE ALSO
       xdg-mime(1), xdg-settings(1), MIME applications associations specification[1]

EXAMPLES
           xdg-open 'http://www.freedesktop.org/'

       Opens the freedesktop.org website in the user's default browser.

           xdg-open /tmp/foobar.png

       Opens the PNG image file /tmp/foobar.png in the user's default image viewing application.

AUTHORS
       Kevin Krammer
           Author.

       Jeremy White
           Author.

COPYRIGHT
       Copyright © 2006

NOTES
        1. MIME applications associations specification
           http://www.freedesktop.org/wiki/Specifications/mime-apps-spec/

xdg-utils 1.0                                              05/19/2018                                                XDG-OPEN(1)