比较文件夹diff，可以直接使用diff命令
[root@~]# diff -urNa dir1 dir2
-a Treat all files as text and compare them line-by-line, even if they do not seem to be text.
-N, --new-file
In directory comparison, if a file is found in only one directory, treat it as present but empty in the other directory.
-r When comparing directories, recursively compare any subdirectories found.
-u Use the unified output format.
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