Linux Interview Questions and Answers
Some common Linux interview questions and answers:
Question: What are the basic components of Linux?
Answer: The basic components of Linux are the kernel, the shell, and the system utilities. The kernel is the core of the operating system and manages all of the hardware resources. The shell is a user interface that allows users to interact with the operating system. The system utilities are a collection of programs that perform various tasks, such as managing files and processes.
Question: What is the difference between Linux and Unix?
Answer: Linux is a Unix-like operating system, which means that it is based on the Unix design philosophy. However, there are some key differences between Linux and Unix. For example, Linux is open source, while Unix is not. Additionally, Linux is available on a wide variety of hardware platforms, while Unix is typically only available on high-end servers.
Question: What is the Linux kernel?
Answer: The Linux kernel is the core of the Linux operating system. It is responsible for managing all of the hardware resources, such as the CPU, memory, and disk storage. The kernel also provides a set of system calls that allow other programs to interact with the hardware.
Question: What is a shell?
Answer: A shell is a user interface that allows users to interact with the Linux operating system. The shell provides a command-line interface, where users can enter commands to perform various tasks, such as managing files and processes.
Question: What is the difference between a hard link and a soft link?
Answer: A hard link is a direct connection between two files. When you create a hard link, both files share the same data. Any changes made to one file are also reflected in the other file.
A soft link is a symbolic link to a file. When you create a soft link, the soft link points to the original file. Any changes made to the original file are also reflected in the soft link.
Question: What is the difference between a process and a thread?
Answer: A process is an instance of a running program. A thread is a lightweight process that shares the same memory space as the parent process. Threads are often used to improve the performance of multithreaded programs.
Question: What is the difference between a file and a directory?
Answer: A file is a collection of data that is stored on disk. A directory is a special type of file that contains a list of other files and directories.
Question: What are the permissions that can be set on files and directories?
Answer: The permissions that can be set on files and directories are read, write, and execute. Read permission allows users to read the contents of a file or directory. Write permission allows users to modify the contents of a file or directory. Execute permission allows users to execute a file.
Question: How do you start and stop a service in Linux?
Answer: To start a service in Linux, you can use the following command:
systemctl start <service-name>
To stop a service in Linux, you can use the following command:
systemctl stop <service-name>
Question: How do you install and uninstall a software package in Linux?
Answer: To install a software package in Linux, you can use the following command:
sudo apt install <package-name>
To uninstall a software package in Linux, you can use the following command:
sudo apt remove <package-name>
These are just a few of the many Linux interview questions that you may be asked. Be sure to practice answering these questions before your interview so that you can give confident and accurate answers.
