linux os-basics,Devops training in Hyderabad
- 1. LINUX TUTORIAL Surender Singh Rathore
- 2. Topics Day-1 : Linux_OS_Basics Day-2 : Linux_Commands Day-3 : File_System Day-4 : Linux_vi_part-I Day-5 : Linux_vi_part-II Day-6 : Advanced_Linux_Commands_part-I Day-7 : Advanced_Linux_Commands_part-II Day-8 : System_Administration Day-9 : Advanced_Sys_Admin Day-10 : Grep Day-11 : Shell_Scripting_part-I Day-12 : Shell_Scripting_part-II Day-13 : Shell_Scripting_part-III Day-14 : Regular_Expressions Day-15 : SED Day-16 : AWK 2
- 3. OS Basics Operating Software - An operating system is a program that acts as an interface between the user and the computer hardware and controls the execution of all kinds of programs. 3
- 5. Functions of OS Memory Management Processor Management Device Management File Management Security Control over system performance Job accounting Error detecting aids Coordination between other software and user 5
- 6. Unix and Linux history Unix History Unix is developed by a team a team of Bell Labs researchers led by Thompson and Ritchie in 1969 Linux history The history of Linux began in 1991 with the commencement of a personal project by Finnish student Linus Torvalds to create a new free operating system kernel. Since then, the resulting Linux kernel has been marked by constant growth throughout its history. Since the initial release of its source code in 1991, it has grown from a small number of C files under a license prohibiting commercial distribution to the 3.18 version in 2015 with more than 18 million lines of source code under the GNU General Public License. 6
- 7. Components of Linux System Kernel - Kernel is the core part of Linux. It is responsible for all major activities of this operating system. It is consists of various modules and it interacts directly with the underlying hardware. Kernel provides the required abstraction to hide low level hardware details to system or application programs. System Library - System libraries are special functions or programs using which application programs or system utilitiess accesses Kernel's features. These libraries implements most of the functionalities of the operating system and do not requires kernel module's code access rights. System Utility - System Utility programs are responsible to do specialized, individual level tasks 7
- 8. Basic Features of Linux OS Portable - Portability means softwares can works on different types of hardwares in same way.Linux kernel and application programs supports their installation on any kind of hardware platform. Open Source - Linux source code is freely available and it is community based development project. Multiple teams works in collaboration to enhance the capability of Linux operating system and it is continuously evolving. Multi-User - Linux is a multiuser system means multiple users can access system resources like memory/ ram/ application programs at same time. 8
- 9. Basic Features of Linux OS Multiprogramming - Linux is a multiprogramming system means multiple applications can run at same time. Hierarchical File System - Linux provides a standard file structure in which system files/ user files are arranged. Shell - Linux provides a special interpreter program which can be used to execute commands of the operating system. It can be used to do various types of operations, call application programs etc. Security - Linux provides user security using authentication features like password protection/ controlled access to specific files/ encryption of data. 9
- 10. Architecture Hardware layer - Hardware consists of all peripheral devices (RAM/ HDD/ CPU etc). Kernel - Core component of Operating System, interacts directly with hardware, provides low level services to upper layer components. Shell - An interface to kernel, hiding complexity of kernel's functions from users. Takes commands from user and executes kernel's functions. Utilities - Utility programs giving user most of the functionalities of an operating systems. 10
- 11. Major Linux OS Distributions 11
- 12. Thanks!