A method for grep to satisfy multiple keywords at the same time

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The grep command in Linux can search for keywords by line, usually just for one keyword, and if there are multiple keywords, you can use the following ways.

Search for any keyword

① grep-E "word1 | word2 | word3" file.txt

Any condition (one of word1, word2, and word3) will match.

Satisfy multiple keywords simultaneously

② grep word1 file.txt | grep word2 | grep word3

Three conditions (word1, word2, and word3) must be met at the same time to match.

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