通过nginx日志，统计最近两天的交易笔数

#!/bin/bash
yesterday=`date -d last-day +%Y-%m-%d`
dayago=`date -d '2 days ago' +%Y-%m-%d`
#echo $yesterday
yester=`grep 'createOrderPayByQrcode.in' /opt/nginx/logs/all_access.$yesterday |wc -l`
oldday=`grep 'createOrderPayByQrcode.in' /opt/nginx/logs/all_access.$dayago |wc -l`
chayi=`expr $yester - $oldday`
echo '昨天交易的笔数为：'$yester ' 前天交易的笔数为：'$oldday ' 两者相差为：'$chayi '笔交易！'