Linux Interview Question and Answer

Linux redhat interview question and answer

December 27,2018, | By Innovative Academy


> man

> Yes, the code is available free anyone can modify and redistribute Linux.

> Freely available can be redistributed and can be modified.

> kernel provide an interface between hardware input/output access request from the application.

> It is a type of shall, provides a user interface for interaction with an operating system.

> Cron allows Linux and Unix users to run commands or scripts at a given date and time. You can schedule scripts to be executed periodically.

> df command.

> File systems use permissions and attribute to regulate the level of interaction that system processes can have with files and directories chmod is a command n Linux and other Unix-like operating systems that allows changing the permissions (or access mode) of a file or directory.

> Stands for yellow dog update modifier, a primary tool for getting, installing package.

> Press 'I' for insert mode: 'w' for save.

> grep regular expression "global regular expression print," processes text line by line and prints any lines which match a specified pattern.

> Kill, killall, pkill, xkill.

> The answer depends on user skills and knowledge about Linux.

> RPM (red hat package manager) is a default open source and most popular package management utility for red hat based systems like (RHEL, Centos, and Fedora). The tool allows system administrator and users to install, update, uninstall, query, verify and manage system software packages n Unix/Linux operating systems.

> uname with option (-a/-v/-r)

> df command

> removes file/dictionary

> chmod.

> wc

> Is –a

> root is the username or account that by default has access to all commands and files on a Linux or other Unix-like operating system. It is also referred to as root account, root user, and the superuser.

> Its sched, as per Linux 3 13 start kernel () first calls sched_init() and userspace process initi.e rest _init() creates a kernel thread passing another function kernel_init() as the point and kernel goes to idle unless called.

> A bootloader also called a boot manager, is a small program that places the operating system (os) of a computer into memory.

> The first thing kernel does is to execute the init program. Init is the root/parent of all processes executing on Linux. Based on the appropriate run-level, scripts are executed to start various processes to run the system and make it functional.

> du command.

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