maillogのローカル配送結果だけgrep抽出するスクリプト

#!/bin/sh
IFS=$'\n';
for line in `grep "to local" maillog | grep "starting delivery"`
do 
  DID=`echo ${line} | sed -e "s/^.*starting delivery \([0-9]*\):.*$/\1/g"`
  grep "delivery ${DID}" maillog | grep -v starting
done