简单统计代码，求优化!

#!/bin/bash

date=`date -d yesterday +%Y%m%d`

wget  -O /mnt/$date-jboss1.txt &> /dev/null

wget  -O /mnt/$date-jboss2.txt &> /dev/null

wget  -O /mnt/$date-mysql.txt &> /dev/null
max1=`cat /mnt/$date-jboss1.txt | grep jboss | cut -d' ' -f2 | sort -un |grep -v ^$| tail -1`

max2=`cat /mnt/$date-jboss2.txt | grep jboss | cut -d' ' -f2 | sort -un | grep -v ^$| tail -1`

min1=`cat /mnt/$date-jboss1.txt | grep jboss | cut -d' ' -f2 | sort -unr |grep -v ^$| tail -1`

min2=`cat /mnt/$date-jboss2.txt | grep jboss | cut -d' ' -f2 | sort -unr | grep -v ^$| tail -1`

let max_j=$max1+$max2
echo max-j=$max_j

let min_j=$min1+$min2
echo min_j=$min_j

echo max_m=`cat /mnt/$date-mysql.txt | grep mysql | cut -d' ' -f2 | sort -un | grep -v ^$| tail -1`

echo min_m=`cat /mnt/$date-mysql.txt | grep mysql | cut -d' ' -f2 | sort -unr |grep -v ^$| tail -1`