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示例输出：
- NOTE: This is only a simulation!
- apt-get needs root privileges for real execution.
- Keep also in mind that locking is deactivated,
- so don't depend on the relevance to the real current situation!
- Reading package lists... Done
- Building dependency tree
- Reading state information... Done
- Suggested packages:
- ctags vim-doc vim-scripts
- The following NEW packages will be installed:
- vim
- 0 upgraded, 1 newly installed, 0 to remove and 45 not upgraded.
- Inst vim (2:8.0.1453-1ubuntu1.1 Ubuntu:18.04/bionic-updates, Ubuntu:18.04/bionic-security [amd64])
- Conf vim (2:8.0.1453-1ubuntu1.1 Ubuntu:18.04/bionic-updates, Ubuntu:18.04/bionic-security [amd64])
这里，-s 选项代表 模拟。正如你在输出中看到的，它不执行任何操作。相反，它只是模拟执行，好让你知道在安装 Vim 时会发生什么。
你可以将 install 选项替换为 upgrade，以查看升级包时会发生什么。
- $ apt-get -s upgrade vim
方法 3 – 使用 Aptitude
在 Debian 及其衍生品中，aptitude 是一个基于 ncurses(LCTT 译注：ncurses 是终端基于文本的字符处理的库)和命令行的前端 APT 包管理器。
使用 aptitude 来查看软件包的版本，只需运行：
- $ aptitude versions vim
- p 2:8.0.1453-1ubuntu1 bionic 500
- p 2:8.0.1453-1ubuntu1.1 bionic-security,bionic-updates 500
你还可以使用模拟选项(-s)来查看安装或升级包时会发生什么。
- $ aptitude -V -s install vim
- The following NEW packages will be installed:
- vim [2:8.0.1453-1ubuntu1.1]
- 0 packages upgraded, 1 newly installed, 0 to remove and 45 not upgraded.
- Need to get 1,152 kB of archives. After unpacking 2,852 kB will be used.
- Would download/install/remove packages.
这里，-V 标志用于显示软件包的详细信息。
- $ aptitude -V -s upgrade vim
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