Splitting a catalina log on Tread dumps

This is a useful script for extracting and splitting thread dumps out of the catalina.out or any other output file.
Java thread dump stack trance is generated by sending hup signal to the jvm using kill -3.
This will generate tread dump on the console log.

The below script collects the dumps in individual files facilitating investigation.
Below is tested on Java 1.6.

cat split_THD.sh
set -x
#
#
#
#
#


FILE=$1

STARTLINE=(`grep -n "Full thread dump Java HotSpot(TM)" ${FILE} |cut -d":" -f1`)
ENDLINE=(`grep -n "JNI global references" ${FILE} |cut -d":" -f1`)

for ((i=0;i<${#STARTLINE[@]};i++))
do
        tail -n +${STARTLINE[$i]} ${FILE} | head -n $((${ENDLINE[$i]} - ${STARTLINE[$i]} + 10)) >thd_${i}
done