Some important Linux Commands for Devops

Today I'm going to share some of the important linux commands that you will be using as a Devops Engineer

So, lets get started

1. cat /etc/os-release -> To get the OS details (eg. name,version etc)

2. ps aux | grep "process_name" -> To get the process owner details ( eg. ps aux | grep "jenkins" )

3. cut -d: -f1 /etc/passwd -> To get the all the users list

4. lsblk -> To get all the list of block devices mapping

5. df -h -> To get the filesystem details

6. uname -a-> To get the OS name, machine name and kernal

7. wget https://... -> To download files from the web.

8. ifconfig -> To check the network interfaces

9. netstat -a -> To list all network ports, routing tables, sockets and connection details

10. apt list --installed -> To check the installed packages ( eg. apt list apache2 -> To check apache2 related packages)

11. apt list | grep nginx -> To check if ngnix is installed

12. dpkg --list | grep nginx -> To check the installed packages

13. cat /etc/services | less -> To check the open ports

14. netstat -atu -> To check the open tcp ports

15. netstat -lntup -> To check the open tcp as well as udp ports that are listening along with their process ids

16. lsof -i 4 -a -p <Process-Number> -> for listing open files related to processes ( 4 implies ipv4, -a is used for Anding the output, -p is used to specify the process id we wish to check)