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! (logical NOT) operator matching IP addresses and ports for Snort rules TCP flag matching, Snort rules <> (direction operator), in Snort rules * operator, TCP flag matching in Snort rules + operator, TCP flag matching in Snort rules -> (direction operator), in Snort rules -nolisten tcp option for startup commands ../ character sequence in requests /dev/mem and /dev/kmem, preventing access to /proc directory, restricting access with grsecurity : (colon), in port ranges for Snort rules | character |