Common centos command line operations, centos command line

Common centos command line operations, centos command line

1. view port usage

Lsof-I tcp: 80

2. check whether a firewall is installed.

Service iptables status

Check whether firewall is enabled
/Etc/init. d/iptables status

3. view all installed packages
Yum list installed

4. Check the number of php-fpm executions.
Ps-fe | grep "php-fpm" | grep "pool" | wc-l

5. The centos memory usage is too high.

Sync

Echo 3>/proc/sys/vm/drop_caches

6. view the linux version

Cat/etc/issue

7. nginx installation path
Whereis nginx

8. Restart the reboot server.
9. server shutdown halt

10. convert files to zip files

Zip-r name.zip/www/
Encapsulate gz
Tar-zcvf db1.tar.gz db1
Tar-zxvf db1.tar.gz unzip gz

11. Decompress tar. xz in linux.

Use xz-d xxx.tar. xz to decompress xxx.tar. xz to xxx.tar.

Decompress tar-xvf xxx.tar

12. view the current folder File Size
Du-sh/home
Ls-lh

13. Copy folder 123 and rename the folder to 456.
Cp-rv/ecmoban/123/ecmoban/456
14. copy to the current folder and rename it
Cp-r mm./mmmm
Copy folder A to directory B
Cp-rv A B
If you are in directory B, you can:
Cp-rv ./
Copy the A1 file under file
Cp-v A/A1 ./
Or
Cp-v A/A1 B/

15. Use vim

Crontab-e for editing
Ctrl + c => shift +: => input wq to save
: Q! Exit and do not save

16. View resources used
Df-h

17. delete an object
Rm-rf ..

18. Modify the folder or file name
Mv ....

19. Change the permissions of folders and subfolders
Chmod-R 777 ..

Chown-R-v root: mail test6

20. Copy commands between linux
Scp-r/home/work/source.txt work@192.168.0.10:/home/work/workers copy the local source.txt file to the/home/work directory on the 192.168.0.10 Machine

Scp-r work@192.168.0.10:/home/work/source.txt/home/work/workers copy the source.txt file on the 192.168.0.10machine to the local/home/work directory

21. view the system version

Cat/etc/issue number of digits getconf LONG_BIT

Cat/proc/cpuinfo | grep "processor" | wc-l view cpu count

22. view the number of php-cgi Processes

Netstat-anpo | grep "php-fpm" | wc-l

23. view the five most occupied memory
Ps-aux | sort-k4nr | head-5

24. Memory cleanup method
Sync
Echo 3>/proc/sys/vm/drop_caches

25. nginx AB testing

AB-c 100-n 1000000-k http: // 127.0.0.1: 8080/

26. Install the sar tool to obtain the network card-level traffic Diagram
Yum install sysstat
# Obtain the network card Traffic Diagram
Sar-n DEV 1 5 // obtain the value once every second, five times in total. Eth0 is the Intranet Nic, and eth1 is the Internet Nic.

27. Install the iftop traffic monitoring tool on the server
Yum install iftop-y // install the tool
Iftop-I eth1-P // use netstat-tunlp | grep 53139 // process corresponding to Port