Frequently asked interview question in Unix

Most commonly asked Questions in Unix. I bet if any one would get prepared with these questions . One would have win the half of the battle of Interview war. 1) Advantages/disadvantages of script vs compiled program. 2) Name a replacement for PHP/Perl/MySQL/Linux/Apache and show main differences. 3) Why have you choosen such a combination of products? 4) Differences between two last MySQL versions. Which one would you choose and when/why? 5) Main differences between Apache 1.x and 2.x. Why is 2.x not so popular? Which one would you choose and when/why? 6) Which Linux distros do you have experience with? 7) Which distro you prefer? Why? 8) Which tool would you use to update Debian / Slackware / RedHat / Mandrake / SuSE ?9) You're asked to write an Apache module. What would you do? 10) Which tool do you prefer for Apache log reports? 11) What does 'route' command do? 12) Differnces between ipchains and iptables. 13) What's eth0, ppp0, wlan0, ttyS0, etc. 14) What are different directories in / for? 15) Partitioning scheme for new webserver. Why? 16) What is a Make file? 17) Could you tell something about the Unix System Kernel? 18) Difference between the fork(), exec() and system() . system calls? 19)How can you tell what shell you are running on UNIX system? 20)What is ‘the principle of locality’?What are conditions for a machine to support Demand Paging? 21)What are conditions on which deadlock can occur while swapping the processes? 22)What are the processes that are not bothered by the swapper? Give Reason. 23)How the Swapper works? 23)What do you mean by u-area (user area) or u-block? 24)What is a Region? 25)What scheme does the Kernel in Unix System V follow while choosing a swap device among the multiple swap devices? 26)What is the main goal of the Memory Management? 27)What is the difference between Swapping and ? 28)List the system calls used for process management? 29)How do you change File Access Permissions? Refer the sites... http://www.geekinterview.com/Interview-Questions/Operating-System/UNIX