DATE=$(date '+%Y-%m-%d_%H%M%S') INTERFACE=eth0 PATH=/var/tmp/ FILENAME=tcpdump_$DATE.pcap # Execute tcpdump command # -W 5 = Limit 5 files # -G 60 = Rotate every 60 seconds /usr/sbin/tcpdump -i $INTERFACE -s0 -w "$PATH/$FILENAME" -W 5 -G 60