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    grep foo | grep bar is a more general way to do AND. Commented Jan 5, 2015 at 15:43
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    +1 for clearly explaining that there isn't a real "AND" operator, and that the best we can do is simulate a hack using an OR structure. This will of course get unwieldy with more than 3 terms, but for two terms it works well. Commented Apr 20, 2017 at 15:57
  • grep -c -e MATCH1 -e MATCH2 is great when you are interested in filename counts. Commented Jul 10, 2019 at 11:26