Linux Interview Questions and Answers

You can kill the process using –

• kill PID – It is used to kill a particular process.
• killall – It is also used to kill all the running processes.

An open-source operating system, Linux is currently one of the best OSs. It can be considered as software that sits underneath and communicates with the other software on a computer and passes on requests from those software programs to the hardware.

Linux is used because it is –

• Highly stable and secure
• Can be maintained easily
• Can run on any hardware system
• Open source and free to use
• Extensive documentation and support

If a Linux server runs out of memory, the kernel moves some inactive processes from Linux server to a disk that acts as the virtual memory. This disk space is called a Swap.

• Multi-tasking is possible without slowing down CPU.
• Offers high security compared to other OSs like Windows, iOS, etc.
• Can be converted from the command line to GUI by installing required packages.
• Open source code with great community and support.
• Can run on different hardware types.
• Hierarchical file system.

Read details about the security features of Linux in the next question of our Linux Interview questions list.

There are multiple reasons for this –

• Linux gives very low access to its users. If there is a virus attack, only a few files will be corrupted not the whole system.
• It is less vulnerable because a user needs complete execution rights for opening even an email attachment.
• The working environment in Linux is segmented in different environments like Ubuntu, Arch, Linux Mint, etc. This division gives much protection from the virus.
• Linux uses Iptables which requires advanced privileges to function.

Linux has a layered structure –

• Hardware - the CPU, RAM, mouse, the keyboard is the hardware
• Kernel - contains device drivers and handles resource allocation, acts as an interface between the hardware and the operating system.
• The standard library of procedures – termed as libc, allows the user to communicate with the kernel.
• User applications and standard utilities – the commands for various tasks like computing, modifying files or taking backups, etc.

The core components of Linux are boot loader, kernel, shell, Daemons, window manager and X window server.

Virtual desktop provides secure access to Linux VDI even from non-Linux devices like Windows. This helps admins manage Windows and Linux applications using one console.