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UNIX INTERVIEW QUESTIONS AND ANSWERS FOR FRESHERS PDF

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Linux, Windows etc. Here I have collected UNIX interview questions with their answers for your reference. If you require download UNIX Faqs in PDF format. UNIX command Questions Answers asked in Interview. UNIX or Linux operating system has become default Server operating system and for whichever. It is intended as a tutorial on the Unix, and commonly asked qestions in all interviews. Contains Important Unix Interview Questions with Answers and Unix FAQs.


Unix Interview Questions And Answers For Freshers Pdf

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unix interview questions with answers, unix shell scripting interview questions, unix commands, General UNIX interview Related Fresher Interview Questions. Basic Theory Questions. 2. What is UNIX? “Unix is an operating system” is not likely to impress the interviewer. The correct answer should look something. what is unix, unix shell, steps UNIX shell follows while processing a command, cmp & diff in UNIX, grep command, cat & more UNIX prompts.

Write command to list all the links from a directory? In this UNIX command interview questions interviewer is generally checking whether user knows basic use of "ls" "grep" and regular expression etc.

You can write command like: This is a simple UNIX command interview questions where you need to create a file and change its parameter to read-only by using chmod command you can also change your umask to create read only file.

Read more about file and directory permission in unix and linux here. How will you find which operating system your system is running on in UNIX? By using command "uname -a" in UNIX. How will you run a process in background? How will you bring that into foreground and how will you kill that process? 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.

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. How do you see command line history in UNIX?

What is Next ?

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. How do you find which process is taking how much CPU? How do you check how much space left in current drive?

By using "df" command in UNIX. For example "df -h. 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.

What is the difference between Swapping and Paging? Whole process is moved from the swap device to the main memory for execution. Process size must be less than or equal to the available main memory. It is easier to implementation and overhead to the system.

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Swapping systems does not handle the memory more flexibly as compared to the paging systems. Only the required memory pages are moved to main memory from the swap device for execution. Process size does not matter.

Gives the concept of the virtual memory. It provides greater flexibility in mapping the virtual address space into the physical memory of the machine. Allows more number of processes to fit in the main memory simultaneously. Allows the greater process size than the available physical memory. Demand paging systems handle the memory more flexibly. What is difference between ps -ef and ps -auxwww?

This is indeed a good Unix Interview Command Question and I have faced this issue while ago where one culprit process was not visible by execute ps —ef command and we are wondering which process is holding the file. How do you find how many cpu are in your system and there details? When a program forks and the child finishes before the parent, the kernel still keeps some of its information about the child in case the parent might need it - for example, the parent may need to check the child's exit status.

Unix Interview Questions | Unix Scripting Interview Questions

To be able to get this information, the parent calls 'wait ' ; In the interval between the child terminating and the parent calling ' wait ' , the child is said to be a 'zombie' If you do 'ps', the child will have a 'Z' in its status field to indicate this. The process is dead but have not been removed from the process table. What is "chmod" command? The line you see shows the permission for three different set of people: User is the currently logged in user, while group is for all other member which are part of certain group and others means anyone other than user and group member.

So in above line, user has only read permission, group members has write permissions and other people has only execute permission. If it is a directory then you need execute permission to go inside that directory. See here for more detailed answer.

How do you set environment variable which will be accessible form sub shell? How do you check if a particular process is listening on a particular port on remote host?

To read more about telnet read networking command in UNIX. Either by using "uname -a" command or by using "arch" command. How do you find which processes are using a particular file?

By using lsof command in UNIX. It wills list down PID of all the process which is using a particular file. How do you find which remote hosts are connecting to your host on a particular port say ? By using netstat command execute netstat -a grep "port" and it will list the entire host which is connected to this host on port What is nohup in UNIX? An UNIX process started with nohup will not stop even if the user who has stared log off from system.

What is ephemeral port in UNIX? Ephemeral ports are port used by Operating system for client sockets. There is a specific range on which OS can open any port specified by ephemeral port range. If one process is inserting data into your MySQL database? How will you check how many rows inserted into every second? Purpose of this Unix Command Interview is asking about watch command in UNIX which is repeatedly execute command provided with specified delay. You have a tab separated file which contains Name, Address and Phone Number, list down all Phone Number without there name and Addresses?

CUT use tab as default separator so you can use.

General UNIX interview questions with answers

Your application home directory is full? How will you find which directory is taking how much space?

By using disk usage DU command in Unix for example du —sh. By using uptime command in UNIX. You have an IP address in your network how will you find hostname and vice versa?

This is a standard UNIX command interview question asked by everybody and I guess everybody knows its answer as well. Please share any interesting UNIX command interview you have come across and I will add into this list. If you are going for any Unix interview on brokerage firm or stock trading company or any Investment bank you can have a quick look here, though most of questions you might already know but its good to review it.

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TOP 70+ Best UNIX Interview Questions with Answers

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How to design a vending machine in Java?

How HashMap works in Java? Why String is Immutable in Java? The information given are the process identification number PID ,the amount of time that the process has taken to execute so far etc.

How would you kill a process? The kill command takes the PID as one argument; this identifies which process to terminate.

What is an advantage of executing a process in background? The most common reason to put a process in the background is to allow you to do something else interactively without waiting for the process to complete. This symbol tells your shell to execute the given command in the background. How do you execute one program from within another?

The system calls used for low-level process creation are execlp and execvp. The execlp call overlays the existing program with the new one , runs that and exits. The original program gets back control only when an error occurs.

What is IPC? What are the various schemes available? The term IPC Inter-Process Communication describes various ways by which different process running on some operating system communicate between each other. Various schemes available are as follows: One-way communication scheme through which different process can communicate.

The problem is that the two processes should have a common ancestor parent-child relationship. However this problem was fixed with the introduction of named-pipes FIFO. Message Queues: Message queues can be used between related and unrelated processes running on a machine. Shared Memory: This is the fastest of all IPC schemes. The memory to be shared is mapped into the address space of the processes that are sharing.

The speed achieved is attributed to the fact that there is no kernel involvement. But this scheme needs synchronization. Various forms of synchronization are mutexes, condition-variables, read-write locks, record-locks, and semaphores.

What is the difference between Swapping and Paging? Whole process is moved from the swap device to the main memory for execution. Process size must be less than or equal to the available main memory. It is easier to implementation and overhead to the system.

Swapping systems does not handle the memory more flexibly as compared to the paging systems. Only the required memory pages are moved to main memory from the swap device for execution.

Process size does not matter. Gives the concept of the virtual memory. It provides greater flexibility in mapping the virtual address space into the physical memory of the machine. Allows more number of processes to fit in the main memory simultaneously.What code would you use in a shell script to determine if a directory exists? A Filter is described as a program, which takes input from the standard input, and displays results to the standard output by performing some actions on it.

The line you see shows the permission for three different set of people: The alias command allows the user to specify or assign another name to a command. I have divided the questions on three categories for sake of managing and keeping this list of Unix Interview questions up to date. The algorithm for writing such a script would be: How do you check how much space left in current drive?

For this it uses the references of spaces and delimiters specified by the user. Submit Comment. Enclose the command in back quotes and assign it to a variable.