- What is the name and the UID of the administrator user?
- How to list all files, including hidden ones, in a directory?
- What is the Unix/Linux command to remove a directory and its contents?
- Which command will show you free/used memory? Does free memory exist on Linux?
- How to search for the string “my konfu is the best” in files of a directory recursively?
- How to connect to a remote server or what is SSH?
- How to get all environment variables and how can you use them?
- I get “command not found” when I run
ifconfig -a. What can be wrong? - What happens if I type TAB-TAB?
- What command will show the available disk space on the Unix/Linux system?
- What commands do you know that can be used to check DNS records?
- What Unix/Linux commands will alter a files ownership, files permissions?
- What does
chmod +x FILENAMEdo? - What does the permission 0750 on a file mean?
- What does the permission 0750 on a directory mean?
- How to add a new system user without login permissions?
- How to add/remove a group from a user?
- What is a bash alias?
- How do you set the mail address of the root/a user?
- What does CTRL-c do?
- What does CTRL-d do?
- What does CTRL-z do?
- What is in /etc/services?
- How to redirect STDOUT and STDERR in bash? (> /dev/null 2>&1)
- What is the difference between UNIX and Linux.
- What is the difference between Telnet and SSH?
- Explain the three load averages and what do they indicate. What command can be used to view the load averages?
- Can you name a lower-case letter that is not a valid option for GNU
ls? - What is a Linux kernel module?
- Walk me through the steps in booting into single user mode to troubleshoot a problem.
- Walk me through the steps you’d take to troubleshoot a 404 error on a web application you administer.
- What is ICMP protocol? Why do you need to use?
I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.
I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.
Find Trusted Cardiac Hospitals
Compare heart hospitals by city and services — all in one place.
Explore Hospitals
