A、copy file1.txt file2.txt
B、cp file1.txt | file2.txt
C、cat file2.txt file1.txt
D、cat file1.txt > file2.txt
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A、copy file1.txt file2.txt
B、cp file1.txt | file2.txt
C、cat file2.txt file1.txt
D、cat file1.txt > file2.txt