Top 70 Linux Interview Questions 2024

This is a common question in Linux interview questions that test knowledge of shell environments. The ps command in Linux is used to provide a snapshot of the currently running processes on the system. It displays essential details such as the Process ID (PID), memory usage, CPU usage, and the status of each process. User mode is the default state where user-level applications and processes run.

What is the sed command used for?

By probing candidates on basic Linux concepts, interviewers can gauge their competence and suitability for roles that require Linux proficiency. As much kernel is important in the linux as an operating system, the questions based on kernel are equally important in the linux interview. Device tree is an important concept in kernel so interviewer may ask this question to check your knowledge about it. The questions based on INODE is the most common linux interview question you may come across in your linux interview. So, read well and get enough knowledge even if you are not familiar with it and get ready with the answer. SSH, or Secure Shell, is a cryptographic network protocol that secures remote access to servers and computers over a network.

What Does a Sudoers File Do in Linux, and How Can You Configure Sudo Access?

Symbolic links are particularly useful for creating accessible links to files located in different directories. The command ensures flexibility and efficiency in file management within the Linux filesystem. An inode stores metadata about a file or directory, including timestamps, ownership, and permissions.

The default runlevel is often set to a multi-user mode with a GUI (runlevel 5). A daemon is a background process that runs independently of user sessions. It is typically started at system boot time and performs system tasks or provides services. Daemons often have no user interaction and continue running even when users log out. /proc (Proc File System) is the virtual file system that shows information about the system and the Kernel data structures.

The Linux kernel’s efficiency and modularity are fundamental to Linux’s performance and security. You can set up a static IP address using the command line interface by modifying the network configuration file. Depending on your Linux distribution, the name and location of the file may vary.

How to check mac address in linux?

The command to delete a user in Linux is userdel, followed by the username. Using the -r option with this command also removes the user’s home directory and mail spool. This action is permanent and affects the user’s access to the system.

Recovery chances depend on how quickly action is taken after deletion and disk activity. Preventive measures, like regular backups, are the best defense against data loss. File recovery is a critical skill for rectifying linux networking interview questions accidental deletions and mitigating potential data loss. To put a running process into the background in Linux, first, pause the process with Ctrl + Z, then use the bg command to resume it in the background. Processes started from the command line can run in the background by appending & at the end of the command.

1. The chmod command in Linux is used to change the permissions of files and directories, allowing users to control who can read, write, or execute a file.
2. A binary package, on the other hand, is a pre-compiled package that is ready to be installed on a system.
3. In linxux we can simply use `-R` option with the `cp` command to recursively copy the file and directories.
4. Pinging an IP address allows you to test whether or not you can reach a specific device on a network.
5. BASH has some extra features and is the default user shell on many Linux installations.

This information is essential for anyone looking to start a career in Linux or for those who are already working in the field and want to take their career to the next level. Changing the default mount options for an ext4 file system involves editing the /etc/fstab file. Specify the desired options in the mount options field for the relevant ext4 entry. This configuration ensures that the ext4 file system is mounted with the specified options at boot, optimizing performance or behavior according to requirements. Careful modification of /etc/fstab is essential to prevent boot issues.

What Are Package Managers in Linux?

Confidence in troubleshooting and problem-solving abilities, supported by real-world scenarios, proves readiness for challenging Linux roles. Discussing experiences with Linux servers, including deployment and maintenance, highlights versatility and expertise. Staying updated with the latest Linux developments and contributing to open-source projects reflect a genuine passion for Linux. The use of the df and du commands in disk management lies in their ability to report disk space usage. Df displays the available and used space of mounted file systems, while du shows the disk space used by files and directories.

1. The term GUI refers to the Graphical User Interface or the human-computer interface.
2. The demand for Linux professionals grows as Linux continues to be one of the most used operating systems.
3. The command plays a pivotal role in software development and deployment by managing file permissions effectively.
4. You can explore more options of the ulimit command by following this guide.
5. The ext4 and XFS file systems differ in their design, performance, and features.
6. This information is crucial for executing other commands accurately, especially when working with files and directories.

As long as they use the same license, they can even sell copies of the modified code. The disadvantages of open source is that it can make the software less compatible with other hardware and systems, and make it more difficult to use. There is also no user support because it is created by potentially thousands of contributors and belongs to the public.