Ubuntu is a free computer system, like Windows or macOS, but it’s built by a community. It’s great for programmers because it’s very flexible and has lots of tools already built-in that help you code.

update-alternatives命令用来维护系统命令的符号链接，可以将多个文件链接到同一个符号文件上，并进行管理。 看看目录在哪里 ...