10.4.1. 从源代码文件导出差异

下面的操作，导出两个源文件的不同，并根据文件的位置，创建通用 diff 文件”file.patch0“ 或 “file.patch1“.

$ diff -u file.old file.new > file.patch0
$ diff -u old/file new/file > file.patch1