But as your grepping skills grow, you’ll see more and more uses for this flexible utility. ConclusionĮven at the most basic usage, grep is a powerful and useful command. Search contactlist.csv for all email addresses with standard top-level domains and send them to a new text file named emails.txt. This matches the standard formatting for U.S. This search looks for three digits inside parentheses, a space, three more digits, a dash, and finally four digits. Search contactlist.csv for any properly formatted phone number. For example, 0* would match one or more zeros.
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