Initial Core 2 study project

quizzes/OS-9-quiz.md

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+# OS-9 Quiz: Linux Client Tools
+
+Take this after studying `notes/OS-9-linux-client-tools.md`.
+
+Reply with answers like:
+`1B 2A 3D 4C 5B 6A 7D`
+
+## Questions
+
+1. Which Linux file lists local user accounts?
+
+A. `/etc/resolv.conf`  
+B. `/etc/fstab`  
+C. `/etc/passwd`  
+D. `/etc/hosts`  
+
+2. Which Linux file stores password hashes and is normally protected?
+
+A. `/etc/hosts`  
+B. `/etc/shadow`  
+C. `/etc/os-release`  
+D. `/etc/fstab`  
+
+3. Which command changes file permissions?
+
+A. `grep`  
+B. `df`  
+C. `dig`  
+D. `chmod`  
+
+4. Which command shows live CPU, memory, and process activity?
+
+A. `pwd`  
+B. `cp`  
+C. `top`  
+D. `cat`  
+
+5. Which command shows mounted file systems and free space in human-readable units?
+
+A. `du -h`  
+B. `df -h`  
+C. `ls -l`  
+D. `mv`  
+
+6. Which package manager is common on Debian and Ubuntu-based Linux distributions?
+
+A. `dnf`  
+B. `regedit`  
+C. `diskpart`  
+D. `apt`  
+
+7. Which command opens Linux manual/help pages?
+
+A. `man`  
+B. `mount`  
+C. `sudo`  
+D. `find`  
+
+## Answer Key For Instructor
+
+1. C
+2. B
+3. D
+4. C
+5. B
+6. D
+7. A
+