diff命令用于逐行对比文件内容的差异。若指定目录，将比较目录内同名文件的内容，但不会递归比较子目录中的文件。 1、 在Ubuntu系统中打开终端，输入diff --help可查看该命令的详细说明。diff命令参数丰富，能用于对比多个文件，快速定位内容差异与修改之处。

A look at what's new in kernel development. Welcome to the new diff -u! We're experimenting with a shorter, more frequent, single-subject format for this feature, which also may evolve over time. Let ...