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10 Linux and UNIX Interview Questions and Answers asked in Wipro TCS Capegemini UNIX and Linux Interview Questions and Answers Questions from various UNIX operating systems e.g. Solaris, Linux, IBM AIX or any other UNIX operating system is asked on different support and programming interviews. I have always seen few interview questions from Linux and UNIX along with SQL in almost every Java programming interviews. You just can not afford not to prepare questions from UNIX and Linux until your Job absolutely doesn't require any work in UNIX operating system. I have collected many UNIX command interview questions and already shared them but I found that except system admin jobs, many programming job interviews only focus on general UNIX commands e.g. chmod, find or grep and fundamentals like finding files and directories, managing file space, networking commands, checking process status and managing file permissions. In this article we will see such kind of frequently asked interview questions and answers from UNIX and Linux operating System. Questions are very fundamental in nature and not limited to Linux only and equally applicable to other UNIX operating systems e.g. Solaris, IBM AIX etc. Many of these UNIX questions are asked during various interviews on companies like TCS, Infosys, Citibank , Wipro, Capegemini and Tech Mahindra. But as I said they are very fundamental and can be asked in any company. UNIX and Linux Interview questions answers

sadguru technologies 8179736190 OBIEE Online Training Course Duration - 40hrs Data warehousing overview Basics of Data Warehousing What is OLTP and OLAP? Difference between OLTP and OLAP Advantages of OLAP What is Data Marts and ODS? Dimensional Modeling Overview Introduction to Dimensional Modeling What are Facts and Dimensions? Star schema and Snowflake schema Introduction to Business Intelligence What is Business Intelligence Where BI tools are Used Why the Oracle Business Intelligence Advantages Architecture, Components Clients - Answers, Delivers, Dashboards and Web administration, Servers- Oracle BI server, Presentation, Scheduler server Server Architecture Repository Basics What is Meta data? Creating a Repository using BI Administration Tool Physical, Business Model and Mapping, and presentation layers Properties of repository objects Building Physical Layer of a Repository Objects of Physical Layer

3. How will you find which operating system your system is running on in UNIX? By using command "uname -a" in UNIX 4. How will you run a process in background? How will you bring that into foreground and how will you kill that process? For running a process in background use "&" in command line. For bringing it back in foreground use command "fg jobid" and for getting job id you use command jobs, for killing that process find PID and use kill -9 PID command. This is indeed a good Unix Command interview questions because many of programmer not familiar with background process in UNIX. 5. How do you know if a remote host is alive or not? You can check these by using either ping or telnet command in UNIX. This question is most asked in various Unix command Interview because its most basic networking test anybody wants to do it. 6. How do you see command line history in UNIX? Very useful indeed, use history command along with grep command in UNIX to find any relevant command you have already executed. Purpose of this Unix Command Interview Questions is probably to check how familiar candidate is from available tools in UNIX operation system. 7. How do you copy file from one host to other? Many options but you can say by using "scp" command. You can also use rsync command to answer this UNIX interview question or even sftp would be ok. 8. How do you find which process is taking how much CPU? By using "top" command in UNIX, there could be multiple follow-up UNIX command interview questions based upon response of this because “TOP” command has various interactive options to sort result based upon various parameter. 9. How do you check how much space left in current drive ? By using "df" command in UNIX. For example "df -h ." will list how full your current drive is. This is part of anyone day to day activity so I think this Unix Interview question will be to check anyone who claims to working in UNIX but not really working on it. Read more: http://javarevisited.blogspot.com/2011/05/unix-command-interview-questions.html#ixzz3W1H6kWrg

Sadguru Technologies--040-40154733-8179736190 1.What are the modes of TIBCO BW Installations ? GUI mode Console mode Silent mode 2.If you have installed a particular version of TIBCO software e.g. TIBCO BW X.Y.Z, What are X, Y and Z number stands for? Integration can be at different application layers: X:Patch Y:Major Z:Minor 3.What is the role of TRA? TRA stands for TIBCO Runtime Agent. The TRA has two main functions: Supplies an agent that is running in the background on each machine. The agent is responsible for starting and stopping processes that run on a machine according to the deployment information. The agent monitors the machine. That information is then visible via TIBCO Administrator. Supplies the run-time environment, that is, all shared libraries including third-party libraries. 4.What are the resources that gets included in the EAR file, created by the TIBCO Designer? An EAR file can contain local project resources, LibraryBuilder resources, and files as specified in AliasLibrary resources. In addition, the TIBCO Designer classpath may include references to other files that are included in the EAR file. TIBCO EAR file 5.What are the revision control system options available in TIBCO designer? File sharing VSS Perforce XML Canon ClearCase iPlanet CVS PVCS

Sadguru Technologies--040-40154733-8179736190 1.What are the modes of TIBCO BW Installations ? GUI mode Console mode Silent mode 2.If you have installed a particular version of TIBCO software e.g. TIBCO BW X.Y.Z, What are X, Y and Z number stands for? Integration can be at different application layers: X:Patch Y:Major Z:Minor 3.What is the role of TRA? TRA stands for TIBCO Runtime Agent. The TRA has two main functions: Supplies an agent that is running in the background on each machine. The agent is responsible for starting and stopping processes that run on a machine according to the deployment information. The agent monitors the machine. That information is then visible via TIBCO Administrator. Supplies the run-time environment, that is, all shared libraries including third-party libraries. 4.What are the resources that gets included in the EAR file, created by the TIBCO Designer? An EAR file can contain local project resources, LibraryBuilder resources, and files as specified in AliasLibrary resources. In addition, the TIBCO Designer classpath may include references to other files that are included in the EAR file. TIBCO EAR file

1.What are the modes of TIBCO BW Installations ? GUI mode Console mode Silent mode 2.If you have installed a particular version of TIBCO software e.g. TIBCO BW X.Y.Z, What are X, Y and Z number stands for? Integration can be at different application layers: X:Patch Y:Major Z:Minor 3.What is the role of TRA? TRA stands for TIBCO Runtime Agent. The TRA has two main functions: Supplies an agent that is running in the background on each machine. The agent is responsible for starting and stopping processes that run on a machine according to the deployment information. The agent monitors the machine. That information is then visible via TIBCO Administrator. Supplies the run-time environment, that is, all shared libraries including third-party libraries. 4.What are the resources that gets included in the EAR file, created by the TIBCO Designer? An EAR file can contain local project resources, LibraryBuilder resources, and files as specified in AliasLibrary resources. In addition, the TIBCO Designer classpath may include references to other files that are included in the EAR file. TIBCO EAR file 5.What are the revision control system options available in TIBCO designer? File sharing VSS Perforce XML Canon ClearCase iPlanet CVS PVCS 6.What are the different modes of service invocation? Services can be invoked in several ways. A one-way operation is executed once and does not wait for a response. A request-response operation is executed once and waits for one response. In a request-response service, communication flows in both directions. The complete interaction consists of two point-to-point messages—a request and a response. The interaction is only considered complete after the response has arrived. Publication (notification) means an operation sends information on an as-needed basis, potentially multiple times. Subscription means incoming information is processed on an as-needed bas

I often get mails from people asking what are the questions generally asked in Weblogic by interviewers. Generally for an Administrator’s positions, in addition to Weblogic questions, there are a lot of Unix questions and a few questions related to process and case handling. These are the important questions that I cover while interviewing. 1. How do you differentiate between a server hang and server crash issue? When a Server crahes, the JAVA process no longer exists. When the Server is hung, it stops responding. We can use the weblogic.ADMIN utilty to ping the server. In case of a hang situation we can take multiple thread dumps and analyze the cause of hang. 2. What can be the various reasons for a server crash? a) Native IO b) SSL Native Libraries c) JVM d) Supported Configuration e) JDBC Driver issue 3. How do you troubleshoot a crash? JVM crash generates a hs_err_pid file. We need to look into the stack trace of the hs_err_pid file . If the thread is from a native io, we need to disable native io. if the stack trace is from the driver, we need to get in touch with the drive team. Quite possibly its a problem with driver. Changing the type of driver can be a workaround. If the thread shows it coming from an optimzed code, we can turn of optimization. If the stack is from native calls of application, its a bug with the application and it has to b modified. 4. Ho do you troubleshoot Server Hang? We can use java weblogic.Admin PING to check if we get a normal response. We need to take multiple thread dumps with kill -3 pid on unix and CTLR Break on Windows. Analyze the thread dump to find the root cause. 5. What can be the reasons of Server hang? Memory leak, databse query taking a long time to return, Deadlock. 6. What is memory leak? Memory leak is when objects are not romved from the heap even when they are not required. 7. What are the various causes for OUT OF MEMORY? a) Insufficient heap size, not able to match the extra load. b) Objects licing too long, like HTTP Sessions. c) Memory leak in application code. d) Full GC not happening due to JVM Bug. 8. How to troubleshoot and overcome such issues? Gather memory data by enabling GC verbose. If its due to Http Session, timing out http session after certain interval might help. Look into the code for jdbc connection handling. Optimizing the heap size according to the load. 9. When does High CPU Usage occur? It occurs when one process or one thread utilizes unexpectedly high proportion of CPU. 10. How to troubleshoot it? In Solaris environment, we need to take pstack and prstack and see what the threads are doing. In Windows we need to use pslist and process explorer. 11. What is Clustering and what is achieved through it? Clustering is the grouping together of servers for the purpose of high availability and scalability. Load balancing and Failover is achieved. 12. How does Cluster Communication Happen? Members of the Cluster communicate over the Cluster Multicast IP and Port by sending periodic heart beat messages. 13. What is the difference between the Sun JVM and BEA JRockit JVM? The most well know JVM is the implementation from Sun. The Sun JVM is called HotSpot. The Sun JVM is shipped in the Java Developer’s Kit (JDK) and Java Runtime Environment (JRE) from Sun. The BEA JRockit JVM from BEA systems is optimized for reliability and performance for server side applications. To achieve this, BEA JRockit JVM uses technologies such as code generation, hot spot detection, code optimization, advanced garbage collection algorithms and tight operating system integration. 14. TUning JVM Parameters. If you have a single processor, single thread machine then you should use the serial collector (default for some configurations, can be enabled explicitly for with -XX:+UseSerialGC). For multiprocessor machines where your workload is basically CPU bound, use the parallel collector. This is enabled by default if you use the -server flag, or you can enable it explicitly with -XX:+UseParallelGC. If you’d rather keep the GC pauses shorter at the expense of using more total CPU time for GC, and you have more than one CPU, you can use the concurrent collector (-XX:+UseConcMarkSweepGC). Note that the concurrent collector tends to require more RAM allocated to the JVM than the serial or parallel collectors for a given workload because some memory fragmentation can occur.

All IEEE Projects for final year projects engineering students 2016. Final Year IEEE Projects implementation is a final part in Academics. It is not just a part in Engineering Studies. It also prepares the students to implement practically what they have learnt in the earlier semesters. Basically Final Year IEEE Projects will be implemented as defined below: • Identifying the best IEEE Base Paper • Developing the project with the algorithms in Base Paper • Preparing a descriptive document & PPT about the project • PROJECTS IN JAVA | PROJECTS IN .NET|ANDROID|CLOUD COMPUTING|BIG DATA|HADOOP • PROJECTS IN IEEE,EMBEEDED, VLSI, BIG DATA, HADOOP, IMAGE PROCESSING AND WEB APPLICATION and WINDOWS APPLICATION Cegonsoft Pvt Ltd, Coimbatore has been actively involved in Job Placement Assistance as a value-added service in the Software Training Program. we have a very consistent and growing Job Placement Track Record. • The Software Training Programs are accommodated by continuous assessments and sharing common Interview FAQs. • Students are encouraged to proactively participate in Seminars on Interview Handling Skills. • During Workshops/Seminars, Knowledge is shared about focusing on all the aspects of an Interview apart from Technical Aspects. • Active Coordination with students from the stage of preparing a professional CV/Resume to attending Interviews and securing a Job. • Interview Questions & Answers will be covered along with course • We Support to Make your Resume Ready as per IT Industry Standards and to Get Interview Calls • Preliminary Preparation ensures that our Students are able to perform confidently in Interviews even it was their First Interview. As a part of our Successful and Continuous Job Placement Assistance, we maintain the track for our student reference. ****Conditions Apply Contact Person: Divya.V CEGONSOFT PVT LTD #108, Nehru street, Near Senthilkumaran Theatre, Ramangar, Coimbatore-641 009 LandLine:0422 -4206205 Mailid:divya.r@cegonsoft.in Mob No: 8523900459

All IEEE Projects for final year projects engineering students 2016. Final Year IEEE Projects implementation is a final part in Academics. It is not just a part in Engineering Studies. It also prepares the students to implement practically what they have learnt in the earlier semesters. Basically Final Year IEEE Projects will be implemented as defined below: • Identifying the best IEEE Base Paper • Developing the project with the algorithms in Base Paper • Preparing a descriptive document & PPT about the project • PROJECTS IN JAVA | PROJECTS IN .NET|ANDROID|CLOUD COMPUTING|BIG DATA|HADOOP • PROJECTS IN IEEE,EMBEEDED, VLSI, BIG DATA, HADOOP, IMAGE PROCESSING AND WEB APPLICATION and WINDOWS APPLICATION Cegonsoft Pvt Ltd, Coimbatore has been actively involved in Job Placement Assistance as a value-added service in the Software Training Program. we have a very consistent and growing Job Placement Track Record. • The Software Training Programs are accommodated by continuous assessments and sharing common Interview FAQs. • Students are encouraged to proactively participate in Seminars on Interview Handling Skills. • During Workshops/Seminars, Knowledge is shared about focusing on all the aspects of an Interview apart from Technical Aspects. • Active Coordination with students from the stage of preparing a professional CV/Resume to attending Interviews and securing a Job. • Interview Questions & Answers will be covered along with course • We Support to Make your Resume Ready as per IT Industry Standards and to Get Interview Calls • Preliminary Preparation ensures that our Students are able to perform confidently in Interviews even it was their First Interview. As a part of our Successful and Continuous Job Placement Assistance, we maintain the track for our student reference. ****Conditions Apply Contact Person: Divya.V CEGONSOFT PVT LTD #108, Nehru street, Near Senthilkumaran Theatre, Ramangar, Coimbatore-641 009 LandLine:0422 -4206205 Email ID:divya.r@cegosnoft.in Mob No: 8523900459

Basically Final Year IEEE Projects will be implemented as defined below: • Identifying the best IEEE Base Paper • Developing the project with the algorithms in Base Paper • Preparing a descriptive document & PPT about the project • PROJECTS IN JAVA | PROJECTS IN .NET|ANDROID|CLOUD COMPUTING|BIG DATA|HADOOP • PROJECTS IN IEEE,EMBEEDED, VLSI, BIG DATA, HADOOP, IMAGE PROCESSING AND WEB APPLICATION and WINDOWS APPLICATION Cegonsoft Pvt Ltd, Coimbatore has been actively involved in Job Placement Assistance as a value-added service in the Software Training Program. we have a very consistent and growing Job Placement Track Record. • The Software Training Programs are accommodated by continuous assessments and sharing common Interview FAQs. • Students are encouraged to proactively participate in Seminars on Interview Handling Skills. • During Workshops/Seminars, Knowledge is shared about focusing on all the aspects of an Interview apart from Technical Aspects. • Active Coordination with students from the stage of preparing a professional CV/Resume to attending Interviews and securing a Job. • Interview Questions & Answers will be covered along with course • We Support to Make your Resume Ready as per IT Industry Standards and to Get Interview Calls • Preliminary Preparation ensures that our Students are able to perform confidently in Interviews even it was their First Interview. As a part of our Successful and Continuous Job Placement Assistance, we maintain the track for our student reference. ****Conditions Apply Contact Person: Divya.V CEGONSOFT PVT LTD #108, Nehru street, Near Senthilkumaran Theatre, Ramangar, Coimbatore-641 009 LandLine:0422 -4206205 Email ID:divya.r@cegosnoft.in Mob No: 8523900459

All IEEE Projects for final year projects engineering students 2016. Final Year IEEE Projects implementation is a final part in Academics. It is not just a part in Engineering Studies. It also prepares the students to implement practically what they have learnt in the earlier semesters. Basically Final Year IEEE Projects will be implemented as defined below:  Identifying the best IEEE Base Paper  Developing the project with the algorithms in Base Paper  Preparing a descriptive document & PPT about the project  PROJECTS IN JAVA | PROJECTS IN .NET|ANDROID|CLOUD COMPUTING|BIG DATA|HADOOP  PROJECTS IN IEEE,EMBEEDED, VLSI, BIG DATA, HADOOP, IMAGE PROCESSING AND WEB APPLICATION and WINDOWS APPLICATION Cegonsoft Pvt Ltd, Coimbatore has been actively involved in Job Placement Assistance as a value-added service in the Software Training Program. we have a very consistent and growing Job Placement Track Record.  The Software Training Programs are accommodated by continuous assessments and sharing common Interview FAQs.  Students are encouraged to proactively participate in Seminars on Interview Handling Skills.  During Workshops/Seminars, Knowledge is shared about focusing on all the aspects of an Interview apart from Technical Aspects.  Active Coordination with students from the stage of preparing a professional CV/Resume to attending Interviews and securing a Job.  Interview Questions & Answers will be covered along with course  We Support to Make your Resume Ready as per IT Industry Standards and to Get Interview Calls  Preliminary Preparation ensures that our Students are able to perform confidently in Interviews even it was their First Interview. As a part of our Successful and Continuous Job Placement Assistance, we maintain the track for our student reference. ****Conditions Apply Contact Person: Divya.V CEGONSOFT PVT LTD #108, Nehru street, Near Senthilkumaran Theatre, Ramangar, Coimbatore-641 009 LandLine:0422 -4206205 Mob No: 8523900459 MAIL ME ON: divya.r@cegonsoft.in