一个统计 CPU 内存 硬盘 使用率的shell脚本详解程序员

#!/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 | awk '{printf $3}'` 
  nice=0 
  temp=`vmstat 1 3 |tail -1` 
  user=`echo $temp |awk '{printf("%s/n",$13)}'` 
  system=`echo $temp |awk '{printf("%s/n",$14)}'` 
  idle=`echo $temp |awk '{printf("%s/n",$15)}'` 
  total=`echo|awk '{print (c1+c2)}' c1=$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