一个统计 CPU 内存 硬盘 使用率的shell脚本

#!/bin/bash
#This script is use for describle CPU Hard Memery Utilization
total=0
idle=0
system=0
user=0
nice=0
mem=0
vmexec=/usr/bin/vmstat
which sar > /dev/null 2>&1
if [ $? -ne 0 ]
then
  ver=`vmstat -V | linuxjishu/13830.html target=_blank class=infotextkey>awk '{printf $3}'`
  nice=0
  temp=`vmstat 1 3 |tail -1`
  user=`echo $temp |awk '{printf("%sn",$13)}'`
  system=`echo $temp |awk '{printf("%sn",$14)}'`
  idle=`echo $temp |awk '{printf("%sn",$15)}'`
  total=`echo|awk '{print (c1+c2)}' c1=$system c2=$user`
fi
echo "#CPU Utilization#"
echo "Total CPU  is already use: $total"
echo "CPU user   is already use: $user"
echo "CPU system is already use: $system"
echo "CPU nice   is already use: $nice"
echo "CPU idle   is already use: $idle"
echo
root_use=$(df -lh | awk 'NR==2' | awk '{print $5}')
dev_use=$(df -lh | awk 'NR==3' | awk '{print $5}')
dev_shm_use=$(df -lh | awk 'NR==4' | awk '{print $5}')
echo "#Hard Utilization#"
echo "/        is already use: $root_use"
echo "/dev     is already use: $dev_use"
echo "/dev/shm is already use: $dev_shm_use"
echo
memery_used=$(free | awk 'NR==2' | awk '{print $3}')
memery_all=$(free | awk 'NR==2' | awk '{print $2}')
memery_percent=$(echo "scale=4;$memery_used / $memery_all" | bc)
percent_part1=$(echo $memery_percent | cut -c 2-3)
percent_part2=$(echo $memery_percent | cut -c 4-5)
echo "#Memery Utilization#"
echo "system memery is already use: $percent_part1.$percent_part2%"

swap_used=$(free | awk 'NR==4' | awk '{print $3}')
swap_all=$(free | awk 'NR==4' | awk '{print $2}')
swap_percent=$(echo "scale=4;$swap_used / $swap_all" | bc)
swap_part1=$(echo $swap_percent | cut -c 2-3)
swap_part2=$(echo $swap_percent | cut -c 4-5)
echo "swap   memery is already use: $swap_part1.$swap_part2%"
echo