![]() If you use the grep command without any option, you need to use \| to separate multiple patterns for the or condition. I prefer method number 3 mentioned below for grep OR operator. Use any one of the following 4 methods for grep OR. You already knew that grep is extremely powerful based on these grep command examples. The following employee.txt file is used in the following examples. The examples mentioned below will help you to understand how to use OR, AND and NOT in Linux grep command. But, you can simulate AND using patterns.
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