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Linux is a critical skill for system administrators, DevOps engineers, and cybersecurity professionals. Below are some essential Linux interview questions along with practical commands and scenarios to help you prepare.
Basic Linux Commands You Should Know:
1. Check System Information
uname -a cat /etc/os-release
– Displays kernel version and OS details.
2. List Files with Detailed Info
ls -la
– Shows hidden files, permissions, and ownership.
3. Find Files by Name
find / -name "filename"
– Searches the entire filesystem for a file.
4. Check Disk Usage
df -h du -sh *
– `df` shows disk space, `du` checks directory sizes.
5. View Running Processes
top ps aux | grep "process_name"
– Monitors system processes in real-time.
6. Network Configuration
ifconfig ip a netstat -tuln
– Checks IP, network interfaces, and listening ports.
7. File Permissions
chmod 755 file.sh chown user:group file.txt
– Modifies file access and ownership.
8. Compress and Extract Files
tar -czvf archive.tar.gz /folder tar -xzvf archive.tar.gz
– Creates and extracts `.tar.gz` files.
9. Search Inside Files
grep "pattern" file.txt grep -r "error" /var/log
– Finds text patterns in files.
10. Schedule Tasks with Cron
crontab -e */5 * * * * /path/to/script.sh
– Sets up automated script execution.
Advanced Linux Questions:
- How do you troubleshoot a slow Linux server?
uptime # Check load average free -h # Memory usage iostat # Disk I/O stats dmesg | tail # Check kernel logs
-
Explain Linux Runlevels.
systemctl get-default systemctl set-default multi-user.target
-
How to secure SSH?
nano /etc/ssh/sshd_config</p></li> </ul> <h1>Disable root login & change port</h1> <p>PermitRootLogin no Port 2222
- What is a Linux kernel module?
lsmod # List loaded modules modinfo ext4 # Get module details
What Undercode Say:
Mastering Linux commands is essential for system administration and cybersecurity. Practice these commands in a lab environment, automate tasks with scripts, and understand logs for troubleshooting. Always verify permissions, monitor system resources, and harden services like SSH.
Expected Output:
$ uname -a Linux server 5.4.0-91-generic #102-Ubuntu SMP Fri Nov 5 16:31:28 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Keep learning and exploring Linux for better system control and security! 🚀
References:
Reported By: Anil Kumar – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅Join Our Cyber World:
- What is a Linux kernel module?
