Top Ten Linux Interview Questions


Dwayne Genoveva

By having the perfect answer the Top Ten Linux Interview Questions you can ace any Linux Interview. I’ve been working as a Freelance Linux Consultant for the past seven years. Over all those years, I’ve been in more than a dozen of roles, attended tens of face-to-face interviews and probably close to a hundred of phone interviews.

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Few painfully obvious things struck me during my time:1) Your encyclopedic knowledge of Linux is far more likely to get you a job than your actual problem solving skills.2) Technical questions asked during phone interviews and even face-to-face interviews tend to be fairly basic. Employers rarely ever go into detailed technical scenarios.3) You will be asked almost the same technical questions at almost all interviews you attend.This means that even if you feel your knowledge of Linux is limited at the moment, make sure to know detailed answers to the following Top Linux Interview Questions and you double your chances of getting the job.You are virtually guaranteed that at least half of the questions asked will sound very similar to the following (I tried to provide the simplest ways to answer these as well, for full answers please refer to What is the difference between TCP and UDP?The basic difference is that TCP establishes a connection before sending data and this allows it to control the dataflow and guarantee that all packets get delivered. UDP simply chucks datagrams onto the wire and if some get lost or arrive in bad order there’s no way to request a resend. However UDP has low network overhead so some services such as DNS resolution, SNMP, DHCP, RIP and VOIP use UDP for its speed and any errors are usually dealt with on the application layer rather than network layer.2) What is the TCP hand shake?TCP requires three packets to set up a socket connection, before any user data can be sent. This is called the tree way TCP handshake. First the requester sends a SYN packet and expects a SYN-ACK packet, to which the initiator replies with ACK packet plus the first chunk of user data. From there on the TCP connection is established and two sides exchange user data using features such as message acknowledgment, retransmission and timeout.3) How does DNS resolution work?A client application requests an IP address from the name server usually by connecting to UDP port 53. The name server will attempt to resolve the FQDN based on its resolver library, which may contain authoritative information about the host requested or cached data about that name from an earlier query. If the name server does not already have the answer, it will turn to root name servers to determine the authoritative for the FQDN in question. Then, with that information, it will query the authoritative name servers for that name to determine the IP address.4) What is an MX record?MX record numerically ranks the mail servers you would prefer to receive email for a domain. The MX record with the lowest number is preferred over the others, but you can set multiple email servers with the same value for simple load balancing.5) Describe Linux boot-up sequenceBIOS reads the MBR where Boot Loader sits, Boot Loader reads Kernel into memory, Kernel starts Init process, Init reads inittab, executes rc.sysinit, the rc script than starts services to reach the default run level and once this is done the last thing that gets run is the rc.local script.6) What is an INODE?All files have its description stored in a structure called ‘inode’. The inode contains info about the file-size, access and modification time, permission and so on. In addition to descriptions about the file, the inode contains pointers to the data blocks of the file.7) How do you search for a pattern and than replace it in an entire file?Using Sed or in Vi editor the search usually involves character ‘s’ slash the pattern to be searched, slash the pattern to replace it with, slash ‘g’ which stands for entire file.8) How do you list and flush all IPtables?Using the iptables command with -L switch first to see all the rules currently present in memory and than -F to flush them.9) How do you list compiled-in Apache modules?Run the httpd daemon as a command with -l parameter.10) What is a zombie?Zombie processes can be identified in the output of ‘ps’ by the presence of ‘Z’ in the STAT column. Zombies are child processes whose parent process diedwithout reaping its children. Zombies can’t be killed with the usual KILL signal.

So there you go. This is the technical part of your Linux interview handled. Don’t ask me why but these are the top most repeated Linux questions at interviews. If it is recruiters lack of creativity or laziness. It is simply a fact. If you want to make absolutely sure you are 100 percent crammed for your all-important upcoming interview, I highly recommend you spend few minutes browsing

– blog dedicated to give you all the answers… and the questions for that matter.

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Austin Multiplexes for Sale Great Investment Opportunities


Vikram Kumar

With the current economic problems, housing prices have really taken a hit. Its not expected to change in the next few months, but most economists expect great changes in housing values in the next couple of years. If you are selling a home today, you probably are going to have a difficult time getting the amount you want. Banks have made it difficult for many people to obtain financing, but for those that do, its certainly a buyers market. If you are considering investing in real estate today, its a wise choice in most metropolitan areas.

Austin, Texas is definitely one of the most diverse metropolitan areas in the South. Youll find all types of property for sale here, including modern homes, multiplexes, luxury homes, and even some fantastic lakefront homes. For those looking for Austin multiplexes for sale, one of the best places to begin is by the University of Texas. There are dozens of multiplexes here, from duplexes to large apartment buildings. Many parents will purchase one of these properties so that their children can live in it while going to school. They will have a great investment property out of the transaction, as well. These properties never have a lack of renters and while the turnover can be high at the semesters end, there is always someone else ready to move in.

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You will find that many of the Austin modern homes for sale are located in master planned communities. Many are gated, ensuring a higher level of security for the residents. Some of these communities are located right on Lake Austin and are some of the most sought after in Austin. Several of these communities are fairly new, ensuring that the architecture, amenities, and surroundings are very modern. Youll love the natural beauty of many of these communities, as well as the parks, biking and hiking trails, and swimming pools. Elegant and elaborate clubhouses become focal points for neighborhood gatherings. The best that Austin has to offer can be found here.

Youll need to get in touch with a great realtor. Not only will they be able to direct you to some of the best neighborhoods for what you are looking for, they can also show you available properties, negotiate with sellers, and finalize the sale. You can search through local newspapers, drive endlessly throughout the city, or spend hours on the internet looking at listings or you can meet with a realtor and have several possibilities within minutes.

When you are looking for some of the best Austin modern homes for sale, youll be quite pleased. There are many to choose from, but youll want to act quickly when you find one that you love. If not, its likely that the property you want will already be sold. People are buying up Austin multiplexes for sale quickly, as its never been a better time to make such an investment.

Pride of Texas offers some fantastic listings on

Austin Modern Homes for Sale

, as well as

Austin Multiplexes for Sale

. Youll find plenty of property descriptions, photos, videos, and pricing on many different types of real estate in the Austin area.

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