grep <text pattern> <file to be checked> grep -f<pattern file> <file to be checked> example: grep -f pattern.txt /var/log/apache2/access.log -f to input search patterns one search pattern per line do not include space/enter empty lines at the end - it will result displaying the whole file as it has enter '\r, '\n' characters contents of pattern.txt : /admin/system-monitor/flood-protect HTTP/1.1" 200 582 /admin/system-monitor/flood-protect HTTP/1.1" 200 590
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