grep 同时满足多个关键字和满足任意关键字

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grep -E "word1|word2|word3"   file.txt51Testing软件测试网 _!uz7T6?$EB2W;T*R

  满足任意条件（word1、word2和word3之一）将匹配。51Testing软件测试网/k9\T1D{^`S-B/G\

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grep word1 file.txt | grep word2 |grep word351Testing软件测试网3\;`6|(w} {W4uUv

  必须同时满足三个条件（word1、word2和word3）才匹配。