trim pcap files for the previous day

trim-yesterday-pcaps.sh

#!/bin/bash
#
#  trim-yesterday-pcaps.sh
#  trim pcap files for the previous day
#  ksaver, May 2019

SENSOR_NAME=$(hostname)
IFACE=eth1
PCAP_SIZE=102400
YESTERDAY=$(date -d "$date - 1 days" +"%Y-%m-%d")
DAILYLOGS="/nsm/sensor_data/$SENSOR_NAME-$IFACE/dailylogs/$YESTERDAY"
SCRIPTNAME=$(basename $0 .sh)
LOGFILE=/var/log/$SCRIPTNAME.log
PRESIZE=$(du -h $DAILYLOGS | awk '{print $1}')

function timestamp() {
	date +"%Y-%m-%d %H:%M:%S"
}

function main() {
	echo "$(timestamp): Trimming $YESTERDAY pcaps.. [PID: $$]"
	echo "$(timestamp): Pcaps size previous to trim: $PRESIZE"
	echo -n $(timestamp)
	/usr/local/bin/trimpcap.py $PCAP_SIZE $DAILYLOGS/*
	if [ $? -eq 0 ]; then
		POSTSIZE=$(du -h $DAILYLOGS | awk '{print $1}')
		echo "$(timestamp): Successful pcap trimming"
		echo "$(timestamp): $YESTERDAY directory size: $POSTSIZE"
	else
		echo "$(timestamp): Error occurred while trimming!"
	fi
}

main >> $LOGFILE

Add this to a cron task and you're all set.