Most asked Interview Questions on Linux

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  • March 8, 2023
  • Networking
Most asked Interview Questions on Linux

Linux is an open-source Unix-like operating system for computers that controls a system’s components, including storage, RAM, and the Processor, as well as the connection between the software and the hardware. First, it was released on October 5, 1991, for computers by Linus Torvalds, and is thought to be quicker and safer than Windows. It is largely built around the Linux Kernel and is openly available for distribution. It can also be loaded on computers, portable devices, tablet PCs, etc. Gentoo, Novell Linux, Debian, Ubuntu, and other variants of the Linux kernel are a few examples.

It is an open-source computing software system developed to offer computer consumers a free and affordable operating system. Because of its effectiveness and quick operation, it has grown to be the most popular system currently available. The typical salary for a Linux technician or engineer, based on multiple sources, varies from $107,805 to $179,000. As a result, you can utilize this fantastic chance to your full potential. And by offering an assortment of the most frequently asked Linux interview questions, we hope to facilitate you in this effort.

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1-Describe what Linux is?

Linux is a computer operating system built on the Linux kernel which is a variant of UNIX software. It is an open-source operating system that can function on a variety of devices. It offers customers a free and inexpensive operating system. They can simply change the software and produce versions in this user-friendly setting.


2-Define Linux Kernel?

The core of the Linux software is called the Linux kernel. It serves as a link between electronics and applications. The kernel transfers the data between software and hardware if indeed the software queries the equipment. When you start your primary player, for instance, it asks the kernel that enables it to play a song through the software. The kernel then contacts the hardware to check for necessary rights or hardware components, such as a headset if one is inserted into the device. Linux cores are mostly used by Android smartphones and Linux OS computers.


3-What distinguishes UNIX and Linux from each other?

Linux is a free, open-source, and non-proprietary system software for general use while UNIX was initially developed as a proprietary operating system for Bell Laboratories, that is subsequently released as their business version.


4-Is the Linux Kernel editable?

Yes. Since the Linux Kernel is available for editing under the General Public License (GPL), anybody really can do so. It falls under the umbrella of an open-source, unrestricted operating system.


5-What fundamental components constitute Linux?

Linux comes with all the required components, including a kernel, terminals, GUIs, system tools, and program applications, comparable to other operating systems. The five parts or factors that makeup Linux are generally enumerated and described as follows:

Kernel: It is the primary or “core” component of Linux and is typically in charge of all significant operating system operations, including device administration, operational processes, etc.

Computer library: System tools or application programs can reach kernel capabilities without coding by using system modules, which are special programs or algorithms. It is employed to put the operating system’s capability into practice.

System utility: System utilities are utility applications capable of carrying out specialized and individualized tasks. These are regarded as being more accountable and giving people control over the system.

Hardware: Physical hardware that includes things like a CPU, monitor, keypad, mouse, etc. is referred to as hardware.

Shell: We can run our instructions, applications, and shell scripts in the shell environment. It is a user-to-kernel interface that shields the user from the intricacy of all kernel operations.


6-How many different kinds of shells exist in Linux?

In Linux, there are five main shells:

C Shell (csh): It is similar to C syntax and offers task management and spell checking.

Korn Shell (ksh): This high-level computer language terminal is called Korn Shell (ksh).

Z Shell (Zsh): It offers some special features like monitoring authentication and logout, creating file names, startup files, and ending remarks.

BASH: The default shell for Linux versions is the Bourne Again Shell (bash).

FISH: Fish is an acronym for Friendly Interactive Shell and offers a web-based setup, auto-suggestions, etc.


7-What is the meaning of Shell in Linux?

A computer software called Shell serves as a conduit between the administrator and the kernel. Applications, instructions, and shell programs can be written by users to interact with the kernel. It takes instructions that are user-comprehensible and transforms them into kernel-friendly language.


8-Describe BASH?

Brian Fox created the Unix terminal and command interpreter known as bash for the Gnu general public license. It serves as a substitute for Bourne Shell and is open software. It may additionally be executed in the command window because it is an interpreted process rather than a built one. Individuals can use this to create instructions and trigger activities. Other Shell scripts can contain instructions that Bash can receive.


9-Describe LILO?

A Linux start driver is called LILO. It is used to start the Linux operating system’s processes by loading it into the primary memory. It is a launcher that is used to start Linux and install the operating system into RAM. Additionally, it is known as a yacht controller and it provides a dual-boot system. It can perform various tasks like beginning the kernel, loading memory, identifying other distributable reserves, and finding the kernel as either an auxiliary boot program or a master boot tool. If we want to use the Linux operating system, we must install a special driver called LILO because it enables Linux OS to start.


10-Describe CLI?

A command language interpreter is known as CLI. It engages in computer program interaction where the user gives text-line commands. It also communicates with computer interfaces; the interface takes text lines and transforms them into instructions for the operating system.


11-What benefit does an open-source program offer?

One of the first open-source technologies was Linux, to which many coders contributed software that was accessible to users. As a result, you could obtain the file and modify the code however you pleased. It offers users a variety of choices and improved protection.


12-What exactly is a swap space?

When the actual RAM is full, swap space is used. The swap area will receive the RAM’s dormant pages. It may take into account using swap folders or a separate swap disc.


13-When executing a command, how do you start a terminal window?

To launch your terminal you can start by typing “terminal” in the menu search box or by hitting CTRL+ALT+T.


14-What is the GUI and how is it used in Linux?

Graphical User Interface is the full form of the abbreviation GUI. It is a mouse-operated human-computer interface that makes use of windows, pictures, symbols, and options. The majority of contemporary apps on electronic devices interact with users via Interface. Button, menu, and message use a mix of graphical and textual interfaces known as GUI.


15-What are the environmental variables of Linux?

They are dynamic variables that have an impact on how computer systems run. Every bootloader has them, and they come in a variety of kinds. They provide data about the behavior of the system and can be made, changed, stored, and removed.

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16-What are the symbolic links in Linux?

Its route will be used to guide it to another file. There is no info in the target folders. Symbolic connections lead to a different file system record somewhere. When a target file is erased, only the connection to that file is eliminated but the data stays intact in the background.


17-What is the meaning of hard links?

On Linux, a file that already exists is known as a hard link. For any file, we can make an infinite number of hard connections. Other hard connections can build relationships.


18-What exactly is redirection?

Redirection is the process of switching the default input and output sources. You can reroute the file or application by use of metacharacters in Linux.


19-What do Demons do?

A daemon is a background function that receives user requests from other computers; daemons are used in various ways by the majority of operating systems and also in Linux.


20-What is the root account?

The user name / “root” has access to all folders and instructions on Linux by default. The root user has access to many functions that a regular user does not, such as altering access controls and downloading software.


21-What exactly is a virtual desktop?

When managing numerous windows on your workstation presents a challenge, the virtual desktop user experience can be used as a solution. You can use one or more applications on a blank slate by using a virtual desktop that saves data from a remote computer.


22-How do you describe the Process Id and INODE features?

Process Id: Each procedure is given a different Id. Until the process is finished, it is used to individually identify a command line throughout the machine.

INODE: The computer system gives each file an individual moniker. In a file system, every inode has a special inode identifier. The number of connections, access method, file format, size, title, and other information regarding files is among the many details that INODE saves.


23-What are the various Linux network connection modes?

Below is a summary of the various network bonding options available in Linux:

The round-robin strategy is the foundation of balance-rr (mode 0 ). This is the basic mode in Linux. It has functions like traffic balancing and failure tolerance.

Active-backup (mode 1): This mode is built on the active-backup strategy. When other nodes falter in this, only one node reacts or functions.

It establishes an XOR (exclusive-or) method to provide load balancing and fault mitigation in balance-xor (mode 2).

Broadcast strategy underpins data transmission (mode 3). It establishes a broadcast state to provide failure tolerance and can only be applied in certain circumstances.

802.3ad (mode 4): This mode, also known as Dynamic Link Aggregation mode, is built on the IEEE 802.3ad specification. It establishes a dynamic link clustering mode compliant with IEEE 802.3ad and establishes generalization groups that use the same speed and multiplexing parameters.

The balance-tlb (mode 5)  is also referred to as the adaptive TLB (Transmit Load Balancing). For load sharing and failure tolerance, it activates TLB mode. Traffic will be distributed depending on each internet backbone in this configuration.

Automatic Load Balancing is another name for balance-alb (mode 6). For load balancing and failure tolerance, it establishes ALB mode. It is not required to have any unique switch functionality.


24-Describe SSH and how to use it to access a remote computer.

As the name implies, SSH (Secure Shell) is essentially a protocol that allows two systems to safely access remote computers or processes and interact with them. It is regarded as the most typical method of gaining entry to distant Linux computers. Since data is typically transmitted over encrypted networks, security is regarded as being very good. You require a web address and IP address in order to access a remote server using SSH.


25-What does the netstat command do?

The netstat (Network Statics) command can be used to view all network links on a machine and is typically used as a connectivity utility for setup and troubleshooting.  It merely offers a way to identify which links are active and whether different TCP/IP features are functioning.


26-What exactly does ping mean?

The ping (Packet Internet Groper) command for Linux is employed to verify the status of a link between a source and a target. Simply put, this command is employed to determine if a network is accessible and if a user can be reached. It additionally has the ability to resolve names, check IP access to a second TCP/IP device, and fix various connection problems. This program can also be used to verify the computer’s IP address and identity.


27-What command is employed to determine the word count in a file?

In Linux, the “wc” function is used to determine the number of words in a file. Word quantity is indicated here by “wc.” It is employed to determine the number of text files’ words, sentences, and characters.


28-What does the grep program do?

The command Grep (Global Regular Expression Print) is utilized to perform a worldwide scan for a specific series of characters within a given file. A regular expression is the term commonly used to describe the search sequence. Simply put, pattern-based scanning is used.


29-Which Linux path functions are there?

The fundamental five Linux directory commands are as follows, and they are used to deal with files and directories:

pwd: Its acronym is “print working directory” (pwd). This function is typically used to show the current operating directory’s path.

Syntax: $ pwd

cd: The abbreviation cd means “change directory.” The most common use of this function is to switch the current working location to the one we want to operate in.

Syntax: $ cd

Is: Its meaning is “inventory.” Typically, this command is used to display a complete summary of the files and folders in the current working directory.

Syntax: The command $ ls mkdir means “create directory.” In Linux, this function typically enables people to make directories.

rmdir: It is used for deleting a directory. Each location listed on the command line is removed or deleted using this statement.

Syntax: $ rmdir


30-Describe samba. Why is it necessary?

Samba is essentially a collection of open-source tools. It supports a variety of operating systems, including OpenVMS, IBM, etc. Simply by offering Microsoft SMB compatibility, it is typically used to link Linux computers to Microsoft network capacity. For every client or consumer using the SMB (Server Message Block) or CIFS (Central Server Message Block) standard, it offers more private, reliable, and quick print and file transfer services.

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