deny hosts removing an Ip and checking tcpwrappers

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http://www.linuxquestions.org – On this link http://www.cyberciti.biz/faq/block-s...ith-denyhosts/ if you search following Quote: grep 'from' /var/log/auth.log|cut -d ' ' –field=13 | uniq -c | sort -nr > ct-result.txt the comment says to grep all the IPs and put them to /etc/hosts.deny I want to try what comment is saying but when I do it I get following error Quote: cut: you must specify a list of bytes, characters, or fields what exactly should I be doing? Also how do I make sure if I installed denyhosts then it is working. I installed but (HowTos)