在为一个应用程序制作RPM安装包时，有时候会想在系统的菜单项里增加一个菜单项，那如何做呢？
首先，列出需要学习的材料：
[1] Desktop Menu Specificationl, http://standards.freedesktop.org/menu-spec/menu-spec-1.0.html
[2] Desktop Entry Specification, http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-1.0.html
[3] Icon Theme Specification, http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html
[4] Red Hat Desktop: Deployment Guide: Chapter 3. Menu Editing and Configuration, https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/4/html/Desktop_Deployment_Guide/ch-ddg-menus.html

根据参考[1]，摘录其中的例子如下：
Example
The company ShinyThings Inc. has developed an application namedWebMirror 1.0 and would like to add its own        submenu to the system menus consisting of a WebMirrormenu item and a WebMirror Admin Toolmenu item. The company will use "shinythings" as its vendor id.        For the purpose of this example all menu items will be available        in two languages, English and Dutch.        The language code for Dutch is nl.
First the company needs to create two .desktop files that describe        the two menu items:
datadir/applications/shinythings-webmirror.desktop:

 [Desktop Entry]          
Encoding=UTF-8          
Type=Application
 Exec=webmirror
         Icon=webmirror          
Name=WebMirror          
Name[nl]=WebSpiegel

and
datadir/applications/shinythings-webmirror-admin.desktop:          

[Desktop Entry]          
Encoding=UTF-8          
Type=Application          
Exec=webmirror-admintool
         Icon=webmirror-admintool          
Name=WebMirror Admin Tool
         Name[nl]=WebSpiegel Administratie Tool

A .directory file needs to be installed to provide a title and icon        for the sub-menu itself:
datadir/desktop-directories/shinythings-webmirror.directory:          

[Desktop Entry]          
Encoding=UTF-8
Icon=webmirror          Name=WebMirror          
Name[nl]=WebSpiegel

And finally, a .menu file needs to be provided that links it all        togther:

gtk-update-icon-cache /usr/share/icons/hicolor
以更新icons的cache，才能生效。

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