Unix basics interview questions

Fundamentals

1. Explain the difference between a process and a thread.
2. What does the permission mode 755 mean?
3. How do you find a process that is listening on port 443?

Practical scenarios

1. You see a zombie process. What does it indicate?
2. How would you schedule a script to run every day at 3 AM?
3. What is the safest way to delete old logs?