如何通过终端更新单个应用程序

Question

我想单独更新 Firefox，而不更新所有应用程序。我想通过终端来做。那可能吗？因为我网速很慢。

我在 GNOME 桌面环境中使用 Ubuntu 15.04。

Answer 1

要仅自行升级 Firefox，请执行以下操作：

sudo apt-get dist-upgrade firefox

或者

sudo apt-get upgrade firefox

从 man apt-get

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.

Answer 2

从终端类型只升级 Firefox：

sudo apt upgrade firefox  

上面的命令在没有--only-upgrade选项的情况下工作。如果您的 Firefox 已经是最新版本，该命令将不会安装任何新软件包，您将收到以下消息：

firefox is already the newest version.

Answer 3

sudo apt-get install firefox

这只会升级firefox到最新版本。

有关详细信息，请使用man apt-get并转到安装部分：

安装

如果您想要升级一个或多个已安装的软件包而不升级系统上的每个软件包，这也是要使用的目标。
与“升级”目标不同，“升级”目标安装所有当前安装的软件包的最新版本，“安装”将仅安装指定软件包的最新版本。
只需提供您想要升级的软件包的名称，如果有更新的版本可用，它将下载并安装它（及其依赖项，如上所述）。