1, showing the largest memory footprint statistical process system, and sorting.
[root@centos7-1data]#ps aux | sort -k4 -nr | head -n1
2, scripting, and while use for network segment 192.168.0.0/24 are achieved, if the address can ping, ping the output if "success!", If not General ping output "fail!"
3, weekly working days 1:30 to / etc to backup / backup directory to save the file name format is "etcbak-yyyy-mm-dd-HH.tar.xz", which is the day before the date of time
(1) Create a backup directory
[root@centos7~]#mkdir backup
(2) modify the execution script and execute permissions plus
[root2centos7 ~] Vim back_etc.sh the tar JCF / the root / Backup / etcbak-`date -d 'Day -1' +% F-% H`.tar.xz / etc / &> / dev / null is written script content chmod + x back_etc.sh plus execute permissions
(3) write Scheduled Tasks
[root@centos7~]#crontab -e 30 1 * * 1-5 /root/back_etc.sh
4, working time, every 10 minutes to perform a check disk space, any partition if it is found higher than 80% utilization, sends an alarm message
(1) content to be executed first written into the script
[root @ centos7data] #vim wall.sh #! / bin / bash # # ******************************** ************************************ #Author: liudalao # QQ: 77,421,225 #Date: 2019-11 -24 #filename: wall.sh #URL: http://www.struggle.com #description: the Test Script at The #Copyright (C): 2019 All Rights Reserved # ************* ************************************************** ***** [ `DF | grep / dev / SD | -NR Sed '. /.* S ([0-9] +) *% / \. 1 / P' | Sort -NR | head gt -1` 80] && result is not displayed on the screen wall disk will be full to be performed directly deposited into the trash
(2) plus the script execute permissions
[root@centos7data]#chmod +x wall.sh
(3) can then execute the script in the scheduled task
[root@centos7~]#crontab -e */10 * * * 0 /data/wll.sh