apt-get update apt-get upgrade
时间: 2023-08-30 07:07:49 浏览: 65
apt-get update命令用于同步/etc/apt/sources.list和/etc/apt/sources.list.d中列出的源的索引,以获取最新的软件包。这个命令会从指定的位置(如Debian存档)检索和扫描Packages.gz文件,以便获取有关新的和更新的软件包的信息。在执行升级或dist-upgrade之前,应始终执行更新操作。请注意,由于无法提前知道软件包文件的大小,因此总体进度条可能不准确。[1]
apt-get upgrade命令用于安装系统上当前安装的所有软件包的最新版本,这些软件包的来源在/etc/apt/sources.list中列出。它会检索并升级当前已安装的具有新版本的软件包,绝不会删除当前已安装的软件包,也不会检索和安装尚未安装的软件包。无法在不改变其他软件包的安装状态的情况下升级的当前已安装软件包的新版本将保持在其当前版本。在执行upgrade之前必须先执行update,以便apt-get知道有新版本的软件包可用。[3]
因此,要更新系统上的软件包,应先执行apt-get update命令来同步软件包索引,然后再执行apt-get upgrade命令来安装最新版本的软件包。
相关问题
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。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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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.
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