cat test.txt | grep '52920'
more test.txt | grep '52920'②、重定向>> 到指定文件tmp.txt中
cat test.txt | grep '52920' >> tmp.txt
cat test.txt | grep '52920'
more test.txt | grep '52920'②、重定向>> 到指定文件tmp.txt中
cat test.txt | grep '52920' >> tmp.txt
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