Or ncat (http://nmap.org/ncat/ http://nmap.org/ncat/). My personal favorite useless example is the persistent webserver: ncat -lkp 8080 --sh-exec 'echo -ne

Or ncat (http://nmap.org/ncat/ http://nmap.org/ncat/). My personal favorite useless example is the persistent webserver: ncat -lkp 8080 --sh-exec 'echo -ne "HTTP/1.0 200 OK\r\n\r\nThe date is "; date;'