在Linux中安装java时有一些update-alternatives命令的用法，因为我是Linux环境的新手，我想知道这个命令的作用以及它的用途
>>sudo update-alternatives --install /usr/bin/java java /usr/lib/java/JDk.../bin/java
答案 0 :(得分：3)
基本上它告诉你的机器使用Jave JDK的替代品而不是默认的那个，在Linux系统中，它是OpenJDK。
手册页的摘要比我写的任何答案都要好：
update-alternatives创建，删除，维护和显示有关符号链接的信息 Debian替代系统。
It is possible for several programs fulfilling the same or similar functions to be installed on a single sys‐
tem at the same time. For example, many systems have several text editors installed at once. This gives
choice to the users of a system, allowing each to use a different editor, if desired, but makes it difficult
for a program to make a good choice for an editor to invoke if the user has not specified a particular prefer‐
ence.
Debian's alternatives system aims to solve this problem. A generic name in the filesystem is shared by all
files providing interchangeable functionality. The alternatives system and the system administrator together
determine which actual file is referenced by this generic name. For example, if the text editors ed(1) and
nvi(1) are both installed on the system, the alternatives system will cause the generic name /usr/bin/editor
to refer to /usr/bin/nvi by default. The system administrator can override this and cause it to refer to
/usr/bin/ed instead, and the alternatives system will not alter this setting until explicitly requested to do
so.
使用--install你指定了一个链接，“/ usr / bin / java”一个名字“java”和一个路径“/ usr / lib / java / JDK ....”你添加了一组替代品系统。 link是主链接的通用名称，name是alternative目录中其符号链接的名称，path是为主链接引入的替代方法。
我希望足够清楚，这里有一个post regarding java alternatives。
对于完整的使用列表，我建议查看相同的手册页，在OS shell上键入man update-alternatives;