The diff command compares text files for similarities and differences line by line. If a folder is specified, diff will only compare files with the same filename in the directory, but not subdirectories within it.
Syntax format: diff [parameter] [directory]
Common parameters:
Example
diff test1.py test2.py
Among them, "<" means that test2.py has one line less than test1.py , ">" means that test2.py has one more line than test1.py
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