LINUX ADMINISTRATION UNIT 1.pdf - 1 TYBSC-IT SEM V WE-IT...

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LINUX ADMINISTRATIONTYBSC-ITSEM VWE-IT TUTORIALS (8097071144/55)1
UNIT 1WE-IT TUTORIALS (8097071144/55)2
CHAPTER 1 : UNIX INTRODUCTIONWhat is UNIX?UNIX is an operating systemIt is a stable, multi-user, multi-tasking system for servers, desktops and laptops.have a graphical user interface (GUI)WE-IT TUTORIALS (8097071144/55)3
TYPES OFUNIXThe most popular varieties of UNIX are Sun Solaris, GNU/Linux, and MacOS X. WE-IT TUTORIALS (8097071144/55)4
THEUNIX OPERATING SYSTEMUNIX operating system is made up of three parts; the kernel, the shell and the programs 1.The kernelkernel of UNIX is the hub of the operating system: 2. The shellshell acts as an interface between the user and the kernel. 3. programsinterface which allows user to perform the task in ease WE-IT TUTORIALS (8097071144/55)5
WHATISLINUXfour main parts that make up a Linux system The Linux kernel The GNU utilities A graphical desktop environment Application software WE-IT TUTORIALS (8097071144/55)6
THELINUX SYSTEMWE-IT TUTORIALS (8097071144/55)7
KERNEL IS PRIMARILY RESPONSIBLEFOR FOUR MAIN FUNCTIONSSystem memory management Software program management Hardware management Filesystem management WE-IT TUTORIALS (8097071144/55)8
SYSTEM MEMORY MANAGEMENTWE-IT TUTORIALS (8097071144/55)9
The kernel swaps the contents of virtual memory locations back and forth from the swap space to the actual physical memory. The memory locations are grouped into blocks called pages. You can see the current status of the virtual memory on your Linux system by viewing the special /proc/meminfoWE-IT TUTORIALS (8097071144/55)10
SOFTWARE PROGRAM MANAGEMENTThe Linux operating system calls a running program a process. The kernel controls how the Linux system manages all the processes running on the system WE-IT TUTORIALS (8097071144/55)11
HARDWARE MANAGEMENTAny device that the Linux system must communicate with needs driver code inserted inside the kernel code The driver code allows the kernel to pass data back and forth to the device, acting as a middle man between applications and the hardware. WE-IT TUTORIALS (8097071144/55)12
INSERTING DEVICE DRIVER CODE IN THELINUX KERNELDrivers compiled in the kernel only way to insert device driver code was to recompile the kernel Driver modules added to the kernel Programmers developed the concept of kernel modules to allow you to insert driver code into a running kernel without having to recompile the kernel. WE-IT TUTORIALS (8097071144/55)13
FILESYSTEM MANAGEMENTLinux can read and write to and from filesystemsused by other operating systems, such as Microsoft Windows. The Linux kernel interfaces with each filesystemusing the Virtual File System (VFS). This provides a standard interface for the kernel to communicate with any type of filesystem.

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