Are you aiming to land a Linux Admin role or level up your career? Mastering these Linux commands is key to optimizing performance, securing systems, and automating workflows. Below are some essential commands and practical examples to help you stand out in interviews and excel in your role.
File Management Commands
1. `ls`: List directory contents.
ls -l /home/user
2. `cp`: Copy files or directories.
cp file1.txt /backup/
3. `mv`: Move or rename files.
mv oldfile.txt newfile.txt
4. `rm`: Remove files or directories.
rm -r /old_directory
Networking Commands
1. `ifconfig`: Display network interface configuration.
ifconfig eth0
2. `ping`: Check network connectivity.
ping google.com
3. `netstat`: Display network connections.
netstat -tuln
4. `ssh`: Securely connect to a remote server.
ssh user@remote_host
System Monitoring Commands
1. `top`: Display real-time system processes.
top
2. `htop`: Interactive process viewer.
htop
3. `df`: Display disk space usage.
df -h
4. `free`: Display memory usage.
free -m
Security Commands
1. `chmod`: Change file permissions.
chmod 755 script.sh
2. `chown`: Change file ownership.
chown user:group file.txt
3. `ufw`: Uncomplicated Firewall management.
ufw allow 22/tcp
4. `fail2ban`: Protect against brute-force attacks.
fail2ban-client status
Automation with Cron Jobs
- Schedule a script to run daily at 2 AM:
crontab -e 0 2 * * * /path/to/script.sh
Docker Management Commands
1. `docker ps`: List running containers.
docker ps
2. `docker build`: Build a Docker image.
docker build -t my_image .
3. `docker-compose up`: Start services using Docker Compose.
docker-compose up -d
What Undercode Say
Mastering Linux commands is not just about memorization but understanding their practical applications in real-world scenarios. Whether you’re managing file systems, securing networks, or automating tasks, these commands form the backbone of a Linux Admin’s toolkit.
For file management, commands like ls, cp, and `rm` are indispensable. Networking commands such as ifconfig, ping, and `ssh` ensure seamless connectivity and troubleshooting. System monitoring tools like top, htop, and `df` provide insights into resource usage, while security commands like chmod, chown, and `ufw` safeguard your systems.
Automation with cron jobs and Docker management further enhances efficiency, making you a standout candidate for any Linux Admin role. Practice these commands regularly, and explore advanced topics like shell scripting and Kubernetes to stay ahead in your career.
For further learning, check out these resources:
By mastering these commands and concepts, you’ll not only ace your interviews but also excel in your role as a Linux Admin. Keep practicing, and stay curious!
References:
Hackers Feeds, Undercode AI
