Linux Troubleshooting Interview Questions And Answers Pdf

linux troubleshooting interview questions and answers pdf

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Are you preparing for a Linux interview? We have prepared some of the commonly asked Linux interview questions and their answers. Linux is a free and opensource Operating system that is based on the Linux kernel.

In this article we will discuss top 30 Linux system admin interview questions with the answers for experience professionals. Below mentioned questions may help the readers to clear Linux interviews. Q:3 What does Sar provides and at which location Sar logs are stored? Ans: Sar Collect, report, or save system activity information. Q:4 How to increase the size of LVM partition?

Linux Interview Questions and Answers

Linux is not just an operating system. Instead, it is a humongous family of free and open-source software operating systems that are based on the Linux kernel. System security and Linux administration go hand to hand.

So, expect Linux questions coming your way when interviewed for a security-based job profile. Here, we have brought together a list of top Linux interview questions and answers that you must know if your potential job opportunity encompasses Linux in any way. Answer : Like any other typical operating system, Linux has an application program, GUIs, kernel, and shells. The main advantage of using Linux as an operating system lies in the fact that it is open source and heavily customizable, which makes it equally ideal to use for seasoned professionals as well as newcomers.

A shell is simply a user interface meant for accessing the services offered by an operating system. Answer : Symbolic links point to directories, files, and programs in Linux. They allow gaining instant access to the object they are pointing without the need to traverse the entire path. Hence, symbolic links are like shortcuts in Windows. A system administrator or the owner of the file or directory can grant permission to others using the chmod command.

It is followed by specifying the receiver s of the permission followed by whether permission is granted or denied, then type of permission, and finally having the name of the file. The permission receiver can be a for all, g for group, o for others, and u for the user. Typeofpermissions can be r for read, w for write, and x for executing.

For instance, a command:. Answer : Simply, a virtual desktop presents an alternative to minimizing and maximizing different windows. Instead of minimizing or restoring different programs, virtual desktops allow shuffling between desktops having different program windows. Many times there is a need to share a program across different virtual desktops. For doing so, simply go to the upper left corner of the program window and click on the pushpin-like icon.

It will pin the application, making it accessible across all the virtual desktops. Answer : Daemons are a way of extending the functionality of the base operating system. In other words, daemons are services that offer several functions that might not be available in the operating system.

The main task of a daemon is to actively listen for a service request and to act upon them at the very same time. Once it completes the service, a daemon gets disconnected and waits for further requests. The importance of the directory is when files are stored on some network.

Moreover, the directory is used for storing software packages installed from a source or software not officially accompanying the distribution. Answer : Linux allows for combining several commands in a single line.

Each of the commands is separated by a semicolon :. The execution is carried in the order the commands are specified, from left to right. Answer : Hard links in Linux point directly to the physical file present on the disk. It simply means that in case the file is renamed or moved to some other location, the link will not break and will still function like before. Answer : Sometimes entering the same command in Linux results in different outputs. This is typically attributed to case sensitivity.

Because Linux is case sensitive, a command that previously produced the desired output might not do the same when executed again. For example, the ls command is responsible for listing all files in the directory.

However, entering LS, lS, or Ls will display an error. Moreover, if there is a program that is named LS, then entering the LS command will execute it rather than listing all files in the directory. Answer : The empty directory name serves as the nameless base of the Linux file system. It serves as an attachment for all other devices, directories, drives, and files present on the system. You can append as many files using the command. For example, to append three files, named file1, file2, and file3, we can use the command:.

You can use the cd command followed by the name of the text editor, like vi, with which you need to edit the file. Enter the text that needs to be replaced in place of the old-text and the new text that needs to be added in place of the new-text. The swap space is some memory space used by the Linux operating system to temporarily hold programs that are running concurrently. Answer : You need to use the nohup command first. The termination will log you out of the program that was invoked.

The protocol makes use of a public-key cryptography authentication method for securing communication between the hosts. If SSH allows for data compression as well as sending graphical commands via X When configured correctly, the SSH protocol provides a secure line that is capable of protecting itself against DNS spoofing and man-in-the-middle attacks.

Answer : A Rootkit is an advanced form of malware that can yield a range of security issues and in many cases go undetected by average antivirus programs. Hence, advanced anti-spyware tools need to be used for checking Rootkit infections in Linux. One such is the rkhunter. Debian and Ubuntu users can use the sudo apt-get install rkhunter command while Red Hat-based distributions can use either the dnf or yum command.

The mascot of Linux is a Penguin from Tux Paint. LINUX, on the other hand, is a completely free and open-source operating system meant for the common masses. Answer: LINUX Kernel is the name given to the low-level systems software which can manage different hardware resources for the users. It helps in providing an interface for the user-level interaction.

Its function is to load the LINUX operating system into the main memory so that the operating system can be initiated. Answer: There are various advantages of an open-source which includes:. Character act as a directory separator and escape character.

It helps as a command argument delimiter and directory separator as well. It follows the convention in naming files, which has eight characters as the file name followed by a dot and three characters in the extension. Answer: The GNU project is a free software that offers various advantages as follows. Answer: A Root Account is a system administrator account which helps in applying complete control over the system.

It helps in creating and maintaining various user accounts and thereby assign them different kinds of permissions as per each account. Answer: CLI is an interface that allows the users to type various kinds of declarative commands which are meant to instruct the computer so that it could perform its particular functions.

It offers greater flexibility to the users. Answer: GUI helps in making use of images and icons so that the users can click and manipulate the way of communication with the computer. It helps in removing dependence over type commands and supports graphical elements representation to interact with the system. This will help in the display of memory usage. The outcome is in the form of Mem etc. The minimum size is, however, the amount of memory installed.

This key combination helps in restarting the system. However, in LINUX, there is no confirmation message displayed earlier to the restart, and the reboot occurs immediately. Answer: The parallel ports include the printers, scanners, and various other electronic devices attached to the computer system.

Answer: pwd stands for print working directory. This command is used for printing the working directory. Answer: Yes, there are various environmental variables in LINUX, which include shell function, which is also known as global shell variables. It can be used as a direct input to another process to get the desired output.

Answer: Grep command is used as a search command so that the specific pattern-based search can be initiated. It helps in using various options and parameters that are along with the command line so that the required file output can be attained. Answer: Yes, we can terminate an ongoing process in LINUX by using the Kill command, which is followed by the pid to terminate the particular process.

The use of Kill 0 can be made to terminate all processes. Answer: Yes, we can insert comments in the command line prompt by typing the symbol before the actual comment text. The shell will, therefore, ignore what is written, and the comment will be shown. Answer : The chage command allows the system administrators in Linux to enforce password aging.

The command is used to change the number of days between mandatory password resets. It can be edited for:. That completes the list of the important Linux interview questions. I hope these questions will help you clear that upcoming Linux interview. There is also a pocketbook available for brushing up on all the basic Linux commands, relevant for Linux Interview. Check out some of the best Linux system administration tutorials.

Are there any wrong answers given? Let us know via the comments window below. A Computer Science graduate interested in mixing up imagination and knowledge into enticing words. Been in the big bad world of content writing since In his free time, Akhil likes to play cards, do guitar jam, and write weird fiction.

Linux Interview Questions

To overcome the simple and toughest interviews, the experts over here prepared a set of questions and answers. These questions will also help on how to work on Linux OS and handle the obstacles while working on a Linux system. Although a student becomes adept at handling any type of question after successfully completing the Linux tutorial and certification from the institutes of GangBoard, this list of Linux interview questions and answers will come in handy for a quick revision and when you are a bundle of nerves before the interview. However, this Linux interview question and answer is for not only learned Linux professionals but also beginners and those with no knowledge can use it to understand the terminologies and the fundamentals of Linux. This field is growing at an astounding pace due to the high demand for certified professionals.

There are many great articles on the Internet about questions for candidates for jobs requiring Linux users, but most of them contain questions for new or workstation users. Try to learn a little about harder Linux distributions showing better knowledge. Gentoo, ArchLinux or even Slackware would be a better option before a potential employer. Ubuntu is a great Linux distribution but it can be chosen by both advanced and new users and the idea is to portray yourself as an advanced user without allowing the employer to doubt about it. Database and files must be backuped separately allowing to immediately replace the old installation restoring the updated database. Depending on the resources it is possible to have 2 synchronized servers online to route the traffic in case one of them fails, normally it requires too much resources since two different geographical locations are needed otherwise there is not sense.

Linux system admin interview questions prepared by industry experts, we hope that these Linux admin questions will help you to crack your next Linux administrator job interview. All the best for your future and happy Linux learning. How could this issue be fixed? This gets applicable to any new users who gets created i. ANS : — Need to define the umask value for the required user.

Top Linux Interview Questions and Answers

What is tail command in Linux? Answer: tail command displays the last part of a file. Instead, you want to check what your logs say about the most recent request to your application.

Explore Now! These questions and answers are suitable for both freshers and experienced professionals at any level. Hard Mount : After restarting the server keep on search nfs mount partition until found the device, if the device not found server not will not boot,. This command is the task manager of linux.

75 Linux Administrator Interview Questions And Answers

Linux Networking Job Interview Questions and Answers

Первой из них были предоставляемые ею данные. Бринкерхофф терпеливо ждал, пока она изучала цифры. - Хм-м, - наконец произнесла.  - Вчерашняя статистика безукоризненна: вскрыто двести тридцать семь кодов, средняя стоимость - восемьсот семьдесят четыре доллара.

Она окинула его высокомерным взглядом и швырнула отчет на стол. - Я верю этим данным. Чутье подсказывает мне, что здесь все верно. Бринкерхофф нахмурился.

How to check Memory stats and CPU stats as a Linux admin? What is tail command in Linux? What is the alternative method to a GUI installation in Linux? Enlist some Linux distributors (Distros) along with its usage? How do you combine two lines from two sorted files in Linux?


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Linux is not just an operating system.



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We have organized the most frequently asked Linux Interview Questions and Answers that help candidates to prepare for the Linux basic interview questions that an interviewer might ask you during your interview.