Clear Zombie Process

This script for clear or kill zombie process for solaris 9 and solaris 10.
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#!/bin/ksh
trap '' 1 2 15
while :
do
for x in `ps -el | awk '$2 ~ /Z/ {print $4}'`
do
preap $x
done
sleep 86400 # every 24 Hrs.
done
trap 1 2 15