自我学习笔记08

1、显示统计占用系统内存最多的进程，并排序。

# -e UNIX选项
# -o pid,ppid,cmd,%men,%cpu 显示pid,ppid 命令 内存和CPU的使用系统资源情况
# --sort=-%men 以内存使用情况倒序方式排列
ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head

2、编写脚本，使用for和while分别实现192.168.0.0/24网段内，地址是否能够ping通，若ping通则输出"success!"，若ping不通则输出"fail!"

# for循环

  1 #!/bin/bash
  2 #
  3 #********************************************************************
  4 #Author:        Ronald-wang
  5 #QQ:            xxx
  6 #Date:          2019-12-22
  7 #FileName：     scanip.sh
  8 #URL:           https://www.cnblogs.com/Ronald-wang/
  9 #Description：      The Scanip script
 10 #Copyright (C):     2019 All rights reserved
 11 #********************************************************************
 12 Col_G="\e[32m"
 13 Col_R="\e[31m"
 14 Col="\e[0m"
 15 IP=$1[ ! -n "$1" ] && exit
 16 for i in {1..255};do
 17     {
 18     ping -c1 -W1 $IP.$i &>/dev/null
 19     [ `echo $?` -eq 0 ]&& echo -e "$Col_G $IP.$i $Col ping success" || echo -e "$Col_R $IP.$i $Col ping fail" 
 20     } &
 21 done
 22 wait

# while循环

 1 #!/bin/bash
  2 #
  3 #********************************************************************
  4 #Author:        Ronald-wang
  5 #QQ:            xxx
  6 #Date:          2019-12-22
  7 #FileName：     scanip.sh
  8 #URL:           https://www.cnblogs.com/Ronald-wang/
  9 #Description：      The test script
 10 #Copyright (C):     2019 All rights reserved
 11 #********************************************************************
 12 Col_G="\e[32m"
 13 Col_R="\e[31m"
 14 Col="\e[0m"
 15 IP=$1
 16 [ ! -n "$IP" ] && exit 
 17 i=1
 18 while [ $i -lt 255 ];do
 19    {
 20    ping -c1 -W1 $IP.$i &>/dev/null
 21     if [ `echo $?` -eq 0 ];then 
 22         echo -e "$Col_G $IP.$i $Col ping success"
 23     else
 24         echo -e "$Col_R $IP.$i $Col ping fail" 
 25     fi
 26     } &
 27    let i++    
 28 done
 29 wait  

3、每周的工作日1:30，将/etc备份至/backup目录中，保存的文件名称格式 为“etcbak-yyyy-mm-dd-HH.tar.xz”，其中日期是前一天的时间

[root@localhost scripts]#vim /etc/crontab 
  1 SHELL=/bin/bash
  2 PATH=/sbin:/bin:/usr/sbin:/usr/bin
  3 MAILTO=root
  4 
  5 # For details see man 4 crontabs
  6 
  7 # Example of job definition:
  8 # .---------------- minute (0 - 59)
  9 # |  .------------- hour (0 - 23)
 10 # |  |  .---------- day of month (1 - 31)
 11 # |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
 12 # |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
 13 # |  |  |  |  |
 14 # *  *  *  *  * user-name  command to be executed
 15 30 13 * * 1-5 root /data/scripts/backup_etc.sh   
 
 # 编写脚本backup_etc.sh
 [root@localhost scripts]#vim backup_etc.sh 
  1 #!/bin/bash
  2 #
  3 #********************************************************************
  4 #Author:        Ronald-wang
  5 #QQ:            xxx
  6 #Date:          2019-12-12
  7 #FileName：     backup.sh
  8 #URL:           https://www.cnblogs.com/Ronald-wang/
  9 #Description：      backup /etc
 10 #Copyright (C):     2019 All rights reserved
 11 #********************************************************************
 12 #ColorStr="\e[31m"
 13 #ColorEnd="\e[0m"
 14 #echo -e "$ColorStr start backup! $ColorEnd"
 15 #sleep 2
 16 Back_Soudir='/etc' # 源备份地址
 17 Back_Desdir='/data/' # 目标备份路径
 18 BackDate=`date -d "1 day ago" +"%Y-%m-%d-%H"` # 目标备份文件名时间戳
 19 BackName='etcbak-'$BackDate # 目标备份文件名
 20 BackPath=$Back_Desdir$BackName # #目标备份全路径及基名                        
 21 tar -cpJ $Back_Soudir -f $BackPath.tar.xz &>/dev/null
 22 #echo -e "$ColorStr backup is finished!$ColorEnd"

 
 

4、工作日时间，每10分钟执行一次磁盘空间检查，一旦发现任何分区利用率高 于80%，就发送邮件报警

[root@localhost scripts]#vim /etc/crontab 
  1 SHELL=/bin/bash
  2 PATH=/sbin:/bin:/usr/sbin:/usr/bin
  3 MAILTO=root
  4 
  5 # For details see man 4 crontabs
  6 
  7 # Example of job definition:
  8 # .---------------- minute (0 - 59)
  9 # |  .------------- hour (0 - 23)
 10 # |  |  .---------- day of month (1 - 31)
 11 # |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
 12 # |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
 13 # |  |  |  |  |
 14 # *  *  *  *  * user-name  command to be executed
 15 */10 *  *  *  1-5 root df|awk -F\% '/^\/dev/{print $1}'|awk '$NF>=80{print $1,$5}'