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Linux常用命令-77：diff
source link: https://xugaoxiang.com/2022/06/26/linux-cmds-77-diff/
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diff 命令以逐行的方式，比较文本文件的异同。如果指定的是文件夹，则 diff 只会比较目录中相同文件名的文件，但不会去比较其中的子目录。
语法格式：diff [参数] [目录]
常用参数：
diff test1.py test2.py
其中， "<" 表示 test2.py 比 test1.py 少了一行内容，">" 表示 test2.py 比 test1.py 多了一行内容
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