Here are the top 40 Linux commands used by DevOps engineers, categorized from beginner to advanced:

🚀 Beginner Level:

1. ls - List files and directories.

2. cd - Change directory.

3. pwd - Print the current working directory.

4. mkdir - Create a new directory.

5. rm - Remove files and directories.

6. cp - Copy files and directories.

7. mv - Move or rename files and directories.

8. touch - Create an empty file.

9. cat - View the contents of a file.

10. grep - Search for patterns in files.

11. chmod - Change file permissions.

12. chown - Change file ownership.

13. tar - Create or extract tar archives.

14. find - Search for files and directories.

15. top - Monitor system processes.

🚀 Intermediate Level:

1. ssh - Connect to remote servers securely.

2. scp - Securely copy files between local and remote systems.

3. rsync - Synchronize files and directories between systems.

4. curl - Transfer data to or from a network server.

5. wget - Download files from the web.

6. sed - Stream editor for text manipulation.

7. awk - Text processing and pattern matching.

8. diff - Compare files line by line.

9. git - Version control system.

10. svn - Subversion version control system.

11. tar - Compress and extract files.

12. gzip - Compress files using gzip algorithm.

13. unzip - Extract files from ZIP archives.

14. crontab - Schedule periodic tasks.

15. systemctl - Control system services.

🚀 Advanced Level:

1. iptables - Configure firewall rules.

2. netstat - Network statistics and connections.

3. ping - Send ICMP echo requests to a network host.

4. ifconfig - Configure network interfaces.

5. route - View and manipulate the IP routing table.

6. dig - DNS lookup utility.

7. nc - Network utility for reading/writing to network connections.

8. lsof - List open files and associated processes.

9. strace - Trace system calls and signals.

10. docker - Containerization platform for building, deploying, and managing applications.

These commands cover a wide range of tasks and are commonly used by DevOps engineers in their day-to-day activities.

🤖 Exercise for Fun

Task: What is the Linux command to

1. To view what's written in a file.

    cat file_name
    Ex: cat file.txt
   

   

2. To change the access permissions of files.

    chmod permission file_name
    Ex- chmod 777 file.txt
   

   

3. To check which commands you have run till now.

    history
   

   

4. To remove a directory/ Folder.

    rm -r directoy/folder
    Ex: rm -r deamon
   

   

5. To create a fruits.txt file and to view the content.

    vim file_name    # create file with contents
    cat file_name    # view content of file
    Ex: vim fruits.txt
        cat fruits.txt
   

   

6. Add content in devops.txt (One in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava.

    echo -e "text\n" >> file_name
    Ex: echo -e "Cherry\nKiwi\nOrange\nGuvava" >> fruits.txt
   

   

7. Show only the top three fruits from the file.

    head -n lines file_name
    Ex: head -n 3 fruits.txt
   

   

8. Show only the bottom three fruits from the file.

    tail -n lines file_name
    Ex: tail -n 3 fruits.txt
   

   

9. To create another file Colors.txt and to view the content.

    vim file_name    # create file with contents
    cat file_name    # view content of file
    Ex: vim colors.txt
        cat colors.txt
   

   

10. Add content in Colors.txt (One in each line) - Red, Pink, White, Black, Blue, Orange, Purple, Grey.

    echo -e "text\n" >> file_name
    Ex: echo -e "Red\nPink\nWhite\nBlack\nBlue\nOrange\nPurple\nGrey" >> colors.txt
    

    

11. To find the difference between fruits.txt and Colors.txt files.

    diff file1 file2
    Ex: diff fruits.txt colors.txt