Unix Interview Questions & Answers
Unix Interview Online Test
1. Discuss the mount and unmount system calls
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2. How do you create special files like named pipes and device files?
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3. What is a FIFO?
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4. Brief about the directory representation in UNIX
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5. How are devices represented in UNIX?
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6. Discuss the mount and unmount system calls
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7. How does the inode map to data block of a file?
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8. What is a shell?
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9. Explain fork() system call.
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10. How can you get/set an environment variable from a program?
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11. How can a parent and child process communicate?
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12. What is a zombie?
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13. What are the process states in Unix?
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14. What Happens when you execute a command?
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15. What is 'ps' command for?
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16. How would you kill a process?
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17. What is an advantage of executing a process in background?
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18. How do you execute one program from within another?
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19. What is major difference between the Historic Unix and the new BSD release of Unix System V in terms of Memory Management?
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20. What is the main goal of the Memory Management?
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21. What scheme does the Kernel in Unix System V follow while choosing a swap device among the multiple swap devices?
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22. What is a Region?
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23. What are the events done by the Kernel after a process is being swapped out from the main memory?
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24. What do you mean by u-area (user area) or u-block?
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25. What are the entities that are swapped out of the main memory while swapping the process out of the main memory?
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26. What is Fork swap?
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27. What is Expansion swap?
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28. How the Swapper works?
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29. What are the processes that are not bothered by the swapper? Give Reason.
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30. What are the requirements for a swapper to work?
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31. What are the criteria for choosing a process for swapping into memory from the swap device?
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32. What are the criteria for choosing a process for swapping out of the memory to the swap device?
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33. What are conditions on which deadlock can occur while swapping the processes?
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34. What are conditions for a machine to support Demand Paging?
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35. What is ‘the principle of locality?
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36. What is the working set of a process?
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37. What is the window of the working set of a process?
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38. What is called a page fault?
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39. What are data structures that are used for Demand Paging?
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40. How the Kernel handles the fork() system call in traditional Unix and in the System V Unix, while swapping?
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41. Difference between the fork() and vfork() system call?
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42. What is BSS(Block Started by Symbol)?
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43. What is Page-Stealer process?
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44. Name two paging states for a page in memory?
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45. What are the phases of swapping a page from the memory?
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46. In what way the Fault Handlers and the Interrupt handlers are different?
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47. What is validity fault?
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48. What does the swapping system do if it identifies the illegal page for swapping?
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49. At what mode the fault handler executes?
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50. What do you mean by the protection fault?
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51. For which kind of fault the page is checked first?
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52. In what way the protection fault handler concludes?
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53. How the Kernel handles both the page stealer and the fault handler?
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