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Grepping for multiple strings in a file

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We will use egrep which accepts a regular expression to grep for multiple strings. tail -f localhost_access_log.txt | egrep “\” 404|\” 500″ Here our example looks at logs to see if we got 404 or 500 request. “GET /favicon.ico HTTP/1.1” 404 973 “GET /login.html HTTP/1.1” 500 1230 “GET /favicon.ico HTTP/1.1” 404 973