Ubuntu点滴--apt-get update和upgrade的作用

 　update
           update is used to resynchronize the package index files from their
           sources. The indexes of available packages are fetched from the
           location(s) specified in /etc/apt/sources.list. For example, when
           using a Debian archive, this command retrieves and scans the
           Packages.gz files, so that information about new and updated
           packages is available. An update should always be performed before
           an upgrade or dist-upgrade. Please be aware that the overall
           progress meter will be incorrect as the size of the package files
           cannot be known in advance.

       upgrade
           upgrade is used to install the newest versions of all packages
           currently installed on the system from the sources enumerated in
           /etc/apt/sources.list. Packages currently installed with new
           versions available are retrieved and upgraded; under no
           circumstances are currently installed packages removed, or packages
           not already installed retrieved and installed. New versions of
           currently installed packages that cannot be upgraded without
           changing the install status of another package will be left at
           their current version. An update must be performed first so that
           apt-get knows that new versions of packages are available.

       dist-upgrade
           dist-upgrade in addition to performing the function of upgrade,
           also intelligently handles changing dependencies with new versions
           of packages; apt-get has a "smart" conflict resolution system, and
           it will attempt to upgrade the most important packages at the
           expense of less important ones if necessary. The dist-upgrade
           command may therefore remove some packages. The
           /etc/apt/sources.list file contains a list of locations from which
           to retrieve desired package files. See also apt_preferences(5) for
           a mechanism for overriding the general settings for individual
           packages.

上面的内容是从apt-get的man文档中摘录出来的。上面表达的意思就是，update的作用是从/etc/apt/source.list文件中定义的源中去同步包的索引文件，即运行这个命令其实并没有更新软件，而是相当于windows下面的检查更新，获取的是软件的状态。

而upgrade则是更据update命令同步好了的包的索引文件，去真正地更新软件。

而dist-upgrade则是更聪明的upgrade，man文档中说它以更聪明的方式来解决更新过程中出现的软件依赖问题，它也是从/etc/apt/source.list文件中获得地址，然后从这些地址中检索需要更新的包。

最后，需要注意的一点是，每回更新之前，我们需要先运行update，然后才能运行upgrade和dist-upgrade，因为相当于update命令获取了包的一些信息，比如大小和版本号，然后再来运行upgrade去下载包，如果没有获取包的信息，那么upgrade就是无效的啦！