ngrep: V1.45, $Revision: 1.93 $

ngrep: invalid option -- '-' usage: ngrep <-hNXViwqpevxlDtTRM> <-IO pcap_dump> <-n num> <-d dev> <-A num> <-s snaplen> <-S limitlen> <-W normal|byline|single|none> <-c cols> <-P char> <-F file> <match expression> <bpf filter> -h is help/usage -V is version information -q is be quiet (don't print packet reception hash marks) -e is show empty packets -i is ignore case -v is invert match -R is don't do privilege revocation logic -x is print in alternate hexdump format -X is interpret match expression as hexadecimal -w is word-regex (expression must match as a word) -p is don't go into promiscuous mode -l is make stdout line buffered -D is replay pcap_dumps with their recorded time intervals -t is print timestamp every time a packet is matched -T is print delta timestamp every time a packet is matched -M is don't do multi-line match (do single-line match instead) -I is read packet stream from pcap format file pcap_dump -O is dump matched packets in pcap format to pcap_dump -n is look at only num packets -A is dump num packets after a match -s is set the bpf caplen -S is set the limitlen on matched packets -W is set the dump format (normal, byline, single, none) -c is force the column width to the specified size -P is set the non-printable display char to what is specified -F is read the bpf filter from the specified file -N is show sub protocol number -d is use specified device instead of the pcap default -K is kill matching TCP connections