diff 用法
diff -Naur [from-file] [to-file] > [YourFileName.patch]
-N In directory comparison, if a file is found in only one directory, treat it as present but empty in the other directory.
-a Treat all files as text and compare them line-by-line, even if they do not seem to be text.
-u Use the unified output format.
-r When comparing directories, recursively compare any subdirectories found.
如果改的東西很多,應該就用 diff -Naur [from-file] [to-file] > [YourFileName.patch] 。
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