sudo apt-get upgrade和update
sudo apt-get update 与 sudo apt-get upgrade 的区别
sudo apt-get update
命令用于更新本地包索引数据库中的软件列表,这使得系统知道可以从哪些地方获取最新的软件版本以及可用的依赖关系[^1]。
sudo apt-get update
相比之下, sudo apt-get upgrade
则是在执行此命令之后才会真正去下载并安装那些已经被标记为可升级的应用程序。该操作基于之前通过 update
获取到的信息来判断是否有更高版本可以替换当前已有的应用程序,并对其进行实际的升级处理[^2]。
当运行 sudo apt-get upgrade
时,它会对已经存在于计算机上的各个应用进行检查并与远程仓库里的最新版做比较;一旦检测到有新的稳定发行版存在,则会自动完成相应的更新过程[^3]。
场景举例:
仅需同步官方服务器数据而不改变任何现有配置或安装状态的情况下:此时应该单独使用
sudo apt-get update
来刷新缓存内的记录。希望确保所有能够被安全地提升其版本号而不会破坏兼容性的组件都得到及时维护的时候:应当先调用一次
sudo apt-get update
, 接着再紧跟一句sudo apt-get upgrade
.
sudo apt-get update sudo apt-get upgrade
sudo apt-get update用于更新软件源列表,它会访问源列表中的每个网址,并将最新的软件列表保存在本地电脑。而sudo apt-get upgrade命令用于将本地已安装的软件与软件列表中对应的软件进行对比,如果发现已安装的软件版本较低,就会提示你进行更新。通过这两个命令,你可以保持系统软件的最新状态,并获取最新的功能和修复。123
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sudo apt-get updatesudo apt-get upgrade
As an AI language model, I don't have the ability to execute commands like a computer. But here's what these commands do:
sudo
is a command that lets you run other commands as a superuser or administrator.apt-get
is a command-line tool used for package management in Ubuntu and other Debian-based Linux distributions.update
updates the package list from the repositories to get the latest version information of packages.upgrade
upgrades all installed packages to their latest versions.
So, when you run sudo apt-get update
, you update the list of packages available in the repositories, and when you run sudo apt-get upgrade
, you upgrade all installed packages to their latest versions.