脚本功能：
    1.查看CPU利用率与负载(top,vmstat,sar)
    2.查看磁盘，inode利用率与I/O负载(df, iostate,iotop,sar,dstat)
    3.查看内存利用率(free，vmstat)
    4.查看TCP连接状态(netstat，ss)
    5.查看CPU与内存占用最高的10个进程(top,ps)
    6.查看网络流量(ifconfig,iftop,iptraf)
    vim sysInfo.sh

    1. #!/usr/bin/bash
    2. ACTION="command(m for help):"
    3. TITLE="system monitor:"
    5. COMMAND_ACTION="Command action："
    6. CPU_LOAD="Look at CPU utilization versus load"
    7. DISK_LOAD="Look at the hard disk I/0 load"
    8. DISK_USE="Check hard disk capacity and utilization"
    9. DISK_INODE="Check the disk inode utilization"
    10. MEM_USE="Check memory usage"
    11. TCP_STATUS="View network connection status and network listening port"
    12. CPU_TOP_10="CPU usage is high in the top 10 processes"
    13. MEM_TOP_10="Top 10 processes with high memory"
    14. TRAFFIC="View the network traffic"
    15. HELP="Help"
    16. EXIT="Exit"
    18. OS_VERSION_INFO="OS not support"
    19. LOGIN_INFO="Please use root account"
    20. VMSTAT_INFO="vmstat command not fount,now install"
    21. IOSTAT_INFO="iostat command not fount,now install"
    23. set_language(){
    24.     ACTION="命令(输入 m 获取帮助)："
    25.     TITLE="系统监控:"
    27.     COMMAND_ACTION="操作命令："
    28.     CPU_LOAD="查看CPU利用率与负载"
    29.     DISK_LOAD="查看硬盘I/0负载"
    30.     DISK_USE="查看硬盘容量以及利用率"
    31.     DISK_INODE="查看硬盘inode利用率"
    32.     MEM_USE="查看内存使用情况"
    33.     TCP_STATUS="查看网络连接状态以及网络监听端口" 
    34.     CPU_TOP_10="查看用占CPU高的前10个进程"
    35.     MEM_TOP_10="查看占用内存高的前10个进程"
    36.     TRAFFIC="查看网络流量"
    37.     HELP="查看帮助手册"
    38.     EXIT="退出"
    40.     OS_VERSION_INFO="系统版本不支持"
    41.     LOGIN_INFO="请使用root用户登录"
    42.     VMSTAT_INFO="vmstat 命令没有发现,现在开始安装"
    43.     IOSTAT_INFO="iostat 命令没有发现,现在开始安装"
    44. }
    46. if [[ "$LANG" = "zh_CN.UTF-8" ]];then
    47.     set_language
    48. fi
    52. help(){
    53.   echo -e "\n\t$COMMAND_ACTION"
    54.   echo -e "\t   1   $DISK_LOAD"
    55.   echo -e "\t   2   $DISK_LOAD"
    56.   echo -e "\t   3   $DISK_USE"
    57.   echo -e "\t   4   $DISK_INODE"
    58.   echo -e "\t   5   $MEM_USE"
    59.   echo -e "\t   6   $TCP_STATUS" 
    60.   echo -e "\t   7   $CPU_TOP_10"
    61.   echo -e "\t   8   $MEM_TOP_10"
    62.   echo -e "\t   9   $TRAFFIC"
    63.   echo -e "\t   m   $HELP"
    64.   echo -e "\t   q   $EXIT\n"
    65. }
    67. #系统版本检测
    68. os_check(){
    69.     if [ -e /etc/redhat-release ];then
    70.         REDHAT=`cat /etc/redhat-release| cut -d' ' -f1`
    71.     else
    72.         DEBIAN=`cat /etc/issue|cut -d' ' -f1`
    73.     fi
    75.     if [ "$REDHAT" == "CentOS" -o "$REDHAT" == "Red" ];then
    76.         P_M=yum
    77.     elif [ "$DEBIAN" == "Ubuntu" -o "DEBIAN" == "ubuntu"];then
    78.         P_M=apt-get
    79.     else
    80.         echo "$OS_VERSION_INFO"
    81.         exit 1
    82.     fi
    83. }
    85. # 使用root登录；$LOGNAME和$USER一样 
    86. if [ $LOGNAME != root ];then
    87.     echo "$LOGIN_INFO"
    88.     exit 1
    89. fi
    91. #检测vmstat命令是否安装
    92. if ! which vmstat &>/dev/null; then
    93.     echo "$VMSTAT_INFO"
    94.     sleep 1
    95.     os_check
    96.     $P_M install procps -y
    97. fi
    99. #检测iostat命令是否安装
    100. which iostat &>/dev/null
    101. if [ $? -ne 0 ];then
    102.     echo "$IOSTAT_INFO"
    103.     sleep 1
    104.     os_check
    105.     $P_M install sysstat -y
    106. fi
    108. #CPU利用率与负载
    109. cpu_load(){
    110.     echo -e "\n\e[32m================= $CPU_LOAD =================\e[0m"
    111.     UTIL=`vmstat | awk '{if(NR==3) print 100-$15"%"}'`    ##100-idle空闲的，NR==3处理第3行
    112.     USER=`vmstat |awk '{if(NR==3) print $13"%"}'`
    113.     SYS=`vmstat |awk '{if(NR==3) print $14"%"}'`
    114.     IOWAIT=`vmstat |awk '{if(NR==3) print $16"%"}'`
    115.     echo "Utile(使用率): $UTIL"
    116.     echo "User use(用户使用率):$USER"
    117.     echo "System use(系统使用率): $SYS"
    118.     echo "I/O wait(I/O等待): $IOWAIT"
    119.     echo
    120. }
    122. #硬盘I/O负载
    123. disk_load(){
    124.     echo -e "\n\e[32m================= $DISK_LOAD =================\e[0m"
    125.     UTIL=`iostat -x -k | awk '/^[v|s]/{OFS=": ";print $1,$NF"%"}'` ##OFS=": "表示以:或者空格分割
    126.     READ=`iostat -x -k | awk '/^[v|s]/{OFS=": ";print $1,$6"KB"}'`
    127.     WRITE=`iostat -x -k | awk '/^[v|s]/{OFS=": ";print $1,$7"KB"}'`            
    128.     IOWAIT=`vmstat |awk '{if(NR==3) print $16"%"}'`
    129.     echo -e "Util:"
    130.     echo -e "${UTIL}"
    131.     echo "I/O wait: $IOWAIT"
    132.     echo -e "I/O Wait: $IOWAIT"
    133.     echo -e "Read/s: \n$READ"
    134.     echo -e "Write/s: \n$WRITE"
    135.     echo
    136. }
    138. #硬盘利用率
    139. disk_use(){
    140.     echo -e "\n\e[32m================= $DISK_USE =================\e[0m"
    141.     DISK_TOTAL=`fdisk -l |awk '/^(Disk|磁盘).*(bytes|字节)/ && /\/dev/{printf $2" ";print $3}'`
    142.     USE_RATE=`df -h | awk '/^\/dev/{print int($5)}'`        ##awk内置函数:int
    143.     DISK_USED=`printf "%-34s%-12s%-12s%-18s%-10s\n" "文件系统" "已用" "总共" "使用率" "挂载点" &&  df -h | awk '/^\/dev/{printf "%-30s%-10s%-10s%-15s%-10s\n",$1,$3,$2,$5,$6}'`
    144.     echo "--------------------------"
    145.     echo -e "Disk toltal:\n${DISK_TOTAL}"
    146.     echo "--------------------------"
    147.     echo -e "Disk used:\n${DISK_USED}"
    148.     echo "--------------------------"
    149.     echo
    150. }
    152. #硬盘inode利用率
    153. disk_inode(){
    154.     echo -e "\n\e[32m================= $DISK_INODE =================\e[0m"
    155.     INODE_USE=`printf "%-34s%-12s%-12s%-18s%-10s\n" "文件系统" "已用" "总共" "使用率" "挂载点" &&  df -i | awk '/^\/dev/{printf "%-30s%-10s%-10s%-15s%-10s\n",$1,$3,$2,$5,$6}'`
    156.     echo "--------------------------"
    157.     echo -e "inode use:\n${INODE_USE}"
    158.     echo "--------------------------"
    159.     echo
    161. }
    163. #内存利用率
    164. mem_use(){
    165.     echo -e "\n\e[32m================= $MEM_USE =================\e[0m"
    166.     MEM_TOTAL=`free -m|awk '{if(NR==2)printf "%.1f" ,$2/1024} END{print "G"}'`  ##%.1保留小数点1位，f是浮点型
    167.     USE=`free -m|awk '{if(NR==2)printf "%.1f" ,$3/1024} END{print "G"}'`
    168.     FREE=`free -m|awk '{if(NR==2)printf "%.1f" ,$4/1024} END{print "G"}'`
    169.     echo -e "Total: $MEM_TOTAL"
    170.     echo -e "Use：$USE"
    171.     echo -e "Free : $FREE"
    172.     echo
    174. }
    176. ##网络连接状态
    177. tcp_status(){
    178.     echo -e "\n\e[32m================= $TCP_STATUS =================\e[0m"
    179.     COUNT=`ss -ant|awk '!/State/{status[$1]++}END{for(i in status) print i,status[i]}'`
    180.     LISTEN=`netstat -antp | awk '/(LISTEN)|(State)/{if( NR == 2) {printf "%-30s%20s%15s    %-20s\n", $1,$4,$8,$9} else {printf "%-30s%20s%15s    %-20s\n", $1,$4,$6,$7}}'`
    181.     echo "--------------------------"
    182.     echo -e "TCP connection status:\n$COUNT"
    183.     echo "--------------------------"
    184.     echo -e "LISTEN：\n${LISTEN}"
    185.     echo "--------------------------"
    186.     echo
    188. }
    190. #占用CPU高的前10个进程
    191. cpu_top10(){
    192.     echo -e "\n\e[32m================= $CPU_TOP_10 =================\e[0m"
    193.     CPU_LOG=/tmp/cpu_top.tmp
    194.     ##printf不带换行符，print会有换行符
    195.     ##sort -k2按照第2列排序 -nr表示逆序
    196.     ps aux|awk '{if(($3>0)){{printf "PID: "$2" CPU: "$3"%% --->  "}for(i=11;i<=NF;i++)if(i==NF)printf $i"\n";else printf $i" "}}'|sort -k4 -nr|head -10 >$CPU_LOG
    197.     ##循环从11列(进程名)开始打印，如果i等于最后一行，就打印i的列并换行，否则就打印i的列
    198.     ##if((i==NF))printf $i"\n";else printf $i也可以写成：if((i==NF))printf{$i"\n"};else {printf $i'
    199.     if [[ -n `cat $CPU_LOG` ]];then        ##-n：字符串长度不是0的话
    200.         #echo -e "\033[32m 参考值${i}\033[0m"
    201.         cat $CPU_LOG
    202.         >$CPU_LOG ##将文件清空
    203.     else
    204.         # echo "No process using the CPU"
    205.         echo "没有使用cpu的进程"
    206.         break 
    207.     fi
    208.     echo 
    210. }    
    212. #占用内存高的前10个进程
    213. mem_top10(){
    215.     echo -e "\n\e[32m================= $MEM_TOP_10 =================\e[0m"
    216.     MEM_LOG=/tmp/mem_top.tmp
    217.     ##printf不带换行符，print会有换行符
    218.     ##sort -k2按照第2列排序 -nr表示逆序
    219.     ps aux|awk '{if(($4>0)){{printf "PID: "$2" MEM: "$4"%% ---> "}for(i=11;i<=NF;i++)if((i==NF))printf $i"\n" ;else printf $i" "}}'|sort -k4 -nr|head -10 >$MEM_LOG
    220.     if [[ -n `cat $MEM_LOG` ]];then        ##-n：字符串长度不是0的话
    221.         cat $MEM_LOG
    222.         >$MEM_LOG ##将文件清空
    223.     else
    224.         # echo "No process using the Memory"
    225.         echo "没有使用内存的进程"
    226.         break 
    227.     fi
    228.     echo
    229. }
    231. #查看网络流量
    232. traffic(){
    233.     echo -e "\n\e[32m================= $TRAFFIC =================\e[0m"
    234.     tmp_file=/tmp/.rx_tx.tmp
    235.     tmp_log=/tmp/.rx_tx.log
    236.     {
    237.         while true
    238.         do
    239.             devs=(`cat /proc/net/dev |  sed -n  '/:/p' | sed 's/:/ /g' | awk '{print $1}'`)
    240.             RX_array_pre=(`cat /proc/net/dev | awk '/:/' | sed 's/:/ /g' | awk '{print $2}'`)
    241.             TX_array_pre=(`cat /proc/net/dev | awk '/:/' | sed 's/:/ /g' | awk '{print $10}'`)
    242.             sleep 1
    243.             pid=`ps -ef|grep $0 |grep -v grep|awk 'NR==1{print $2}'`
    245.             if [[ $$ -ne $pid || -e $tmp_file ]];then
    246.                 rm -rf $tmp_file
    247.                 break;
    248.             fi
    250.             RX_array_next=(`cat /proc/net/dev | awk '/:/' | sed 's/:/ /g' | awk '{print $2}'`)
    251.             TX_array_next=(`cat /proc/net/dev | awk '/:/' | sed 's/:/ /g' | awk '{print $10}'`)
    253.             for i in `seq ${#RX_array_next[@]}`
    254.             do
    255.                 RX_array[i-1]=$((${RX_array_next[i-1]}-${RX_array_pre[i-1]}))
    256.                 TX_array[i-1]=$((${TX_array_next[i-1]}-${TX_array_pre[i-1]})) 
    257.                 if [[ ${RX_array[i-1]}  -lt 1024 ]];then
    258.                     RX_array[i-1]="${RX_array[i-1]}B/s"
    259.                 elif [[ ${RX_array[i-1]}  -gt 1048576 ]];then
    260.                     RX_array[i-1]=$(echo ${RX_array[i-1]}  | awk '{print $1/1048576 "MB/s"}')
    261.                 else
    262.                     RX_array[i-1]=$(echo ${RX_array[i-1]}  | awk '{print $1/1024 "KB/s"}')
    263.                 fi
    265.                 if [[ ${TX_array[i-1]}  -lt 1024 ]];then
    266.                     TX_array[i-1]="${TX_array[i-1]}B/s"
    267.                 elif [[ ${TX_array[i-1]}  -gt 1048576 ]];then
    268.                     TX_array[i-1]=$(echo ${TX_array[i-1]}  | awk '{print $1/1048576 "MB/s"}')
    269.                 else
    270.                     TX_array[i-1]=$(echo ${TX_array[i-1]}  | awk '{print $1/1024 "KB/s"}')
    271.                 fi
    273.             done
    274.             clear
    275.             echo -e "\n\e[32m================= $TRAFFIC =================\e[0m" >> $tmp_log
    276.             echo -e "`date '+%Y-%m-%d %H:%M:%S'`\n" >> $tmp_log
    277.             printf "%-15s%-15s%-15s\n" "DEV" "RX(下行)" "TX(上行)" >> $tmp_log
    278.             for i in `seq ${#RX_array_next[@]}` 
    279.             do
    280.                 printf "%-15s%-15s%-15s\n" ${devs[i-1]} ${RX_array[i-1]} ${TX_array[i-1]} >> $tmp_log
    281.             done
    282.             cat $tmp_log
    283.             > $tmp_log 
    284.             echo -n -e "\n(q for quit): "
    286.         done
    287.     } &
    290.     while true 
    291.     do
    292.         read flag
    293.         if [[ "$flag" = "q" ]];then
    294.             touch $tmp_file
    295.             break;
    296.         fi
    297.     done
    299. }
    302. echo "$TITLE"
    303. while [[ true ]]; do
    304.   read -p "$ACTION" command
    305.   case "$command" in
    306.     m )
    307.       help
    308.       ;;
    309.     q )
    310.       exit 0
    311.       ;;
    312.     1 )
    313.         cpu_load
    314.         ;;
    315.     2 )
    316.         disk_load
    317.         ;;
    318.     3 )
    319.         disk_use
    320.         ;;
    321.     4 )
    322.         disk_inode
    323.         ;;
    324.     5 )
    325.         mem_use
    326.         ;;    
    327.     6 )
    328.         tcp_status
    329.         ;;    
    330.     7 )
    331.         cpu_top10
    332.         ;;    
    333.     8 )
    334.         mem_top10
    335.         ;;    
    336.     9 )
    337.         traffic
    338.         ;;    
    339.     * )
    340.       help 
    341.       ;;
    342.   esac
    343. done