unix linux operating system ppt

... LESSON 9 Linux Operating System Vulnerabilities and security Objectives ♦ Describe the fundamentals of the Linux operating system ♦ Describe the vulnerabilities of the Linux operating system ... system ♦ Describe Linux remote attacks ♦ Explain countermeasures for protecting the Linux operating system 2 Review of Linux Security Fundamentals ♦ Linux is a version of UNIX – Usually available ... sc/etc/shadow Root:2bcadvr345:0:0:root: /root: /bin/bash - John The Ripper - Viper - Slurple 6 7 Linux File System ♦ Ls –l ♦ -r-x-r-x-wx ♦ Chmod 777 a.txt Firewall: iptables 8 9 10

Ngày tải lên: 29/07/2014, 08:20

... Trang 1Linux Operating System Trang 2Nội dung Tổng quan về hệ điều hành Linux  Hệ thống tập tin trên Linux  Bộ thông dịch lệnh  Lập trình shell script Trang 3Các thành phần của Linux OSTrang ... Ngô Bá Hùng - Linux - Các lệnh cơ bản  Ngô Bá Hùng - Linux - Hệ thống tập tin  FOSS-Wire.com - Unix/Linux Command Reference [http://sites.google.com/site/nbhung/open-source]  UNIX Tutorial ... dộng,  POSIX (Portable Operating System Interface for Computer Environments): cho phép ứng dụng phát triển trên Linux có thể dùng trên các hệ thống khác như UNIX  Miễn phí, mã nguồn mở &

Ngày tải lên: 08/05/2021, 13:20

... 1Case Study 1: UNIX and LINUXChapter 10 10.1 History of unix 10.2 Overview of unix 10.3 Processes in unix 10.4 Memory management in unix 10.5 Input/output in unix 10.6 The unix file system 10.7 ... directory entry Trang 32UNIX File System (1)Disk layout in classical UNIX systems Trang 33UNIX File System (2)Directory entry fields Structure of the i-node Trang 34UNIX File System (3) The relation ... found in most UNIX systems Trang 26The UNIX File System (2)• Before linking. • After linking. (a) Before linking (b) After linking Trang 27The UNIX File System (3)• Separate file systems • After

Ngày tải lên: 18/10/2014, 15:30

... Some important directories found in most UNIX systems Trang 30The  lstat  System Call Fields returned by the lstat system call Trang 32UNIX File System (1) Disk layout in classical UNIX systems Trang 33UNIX File System (2) ... 1Case Study 1: UNIX and LINUX Chapter 10 10.1 History of unix  10.2 Overview of unix  10.3 Processes in unix  10.4 Memory management in unix  10.5 Input/output in unix  10.6 The unix file system  10.7 Security in unix  ... Trang 22UNIX  I/O (1) Some of the fields of a typical cdevsw table Trang 23UNIX  I/O (2) The UNIX I/O system in BSD Trang 24Streams An example of streams in System V Trang 25The UNIX File System (1)

Ngày tải lên: 30/01/2020, 04:43

... threecolor components), and because it is a color system with which many program-mers and end users are familiar with (it’s common to several operating systems).The BeOS defines rgb_color as a struct ... of 256 colors A pixel value in the range of 0 to 255 is used as an index into a color map This system color map isidentical for all applications That means that when two programs use thesame ... defining analpha byte, which is used to specify a transparency level for a color Trang 3RGB Color SystemAs listed above, the BeOS supports a number of color spaces The RGB colorspace is popular

Ngày tải lên: 26/01/2014, 07:20

... messages and handle them.For the most part, system messages are handled automatically; for instance, when a B_ZOOM message is received, the operating system zooms the window But youcannot completely ... Application Server delivers a system message to an applicationwindow, that message arrives in the form of a BMessage object Your code deter-mines how to handle a system message simply by overriding ... 10When the program refers to a system message by its Be-defined constant, such asB_QUIT_REQUESTED or B_KEY_DOWN, what’s really of interest is the what datamember of the system message The value of

Ngày tải lên: 26/01/2014, 07:20

... the history of the UNIX operating system from which Linux is derived and the principles which Linux is designed upon „ To examine the Linux process model and illustrate how Linux schedules processes ... platforms „ The core Linux operating system kernel is entirely original, but it can run much existing free UNIX software, resulting in an entireUNIX-compatible operating system free from proprietary ... Trang 1Chapter 21: The Linux SystemTrang 2Chapter 21: The Linux SystemTrang 321.3 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7 th Edition, Feb 6, 2005Objectives

Ngày tải lên: 28/06/2014, 02:20

... a system administrator, ning with an explanation of the duties of a system administrator and continu-ing through installing your system and finishing with descriptions of the filesystem and system ... taughtcourses on Unix, Linux, TCP/IP, and Novell Netware.Pennsylva-Terry is the author of Red Hat Enterprise Linux 4 For Dummies and has co-authored and contributed to several other Linux books He ... following books: KDE Bible, The Samba Book, Unix Weekend Crash Course, Red Hat Linux 9 For Dummies, Solaris 9 For Dummies, Fedora Linux 2 For Dummies, and Linux Timesaving Techniques For Dummies.

Ngày tải lên: 07/07/2014, 09:20

... System Boot ■■ Shutting Down the System ■■ Changing the GRUB Configuration All Red Hat systems, whether Fedora Core or Enterprise Linux, use a similarprocedure for starting up the operating system ... communicate with the system componentsuntil the operating system is up and running and able to take over systemmanagement functions Unlike the operating system, which is installed on auser-writable ... desktop ■■ System Tools— This menu choice gives you access to many EnterpriseLinux system administration utilities Tools for configuring your net-work and printers are located here ■■ System Settings—

Ngày tải lên: 07/07/2014, 09:20

... File System NFS Overview NFS is the most common method used to share files across Linux and UNIXnetworks It is a distributed file system that enables local access to remotedisks and file systems ... Hat Enterprise Linux systems, the /etc/exportsfile is the main NFS configuration file It lists the file systems the serverexports, the systems permitted to mount the exported file systems, and ... file systems youwant to share and several daemons that make these shared file systems visible com-to and available for use by client systems on the network When an NFS server is sharing a file system

Ngày tải lên: 07/07/2014, 09:20

... Because Linux supports so many file systems, this chapter discusses only a few of the many file systems and file system options mount’s manual page contains a complete list of the file systems ... mounted file system rw 1 Mounts the file system in read/write mode suid 1 Enables set-UID and set-GID bits on the file system sync 1 Enables synchronous file system I/O on the file system user ... local file systems, ignoring, for example, NFS mounted file systems -x its df’s report to the current file system or the file system to which name refers.-t typelimits the report to file systems

Ngày tải lên: 07/07/2014, 09:20

... for children and zombies now follow.The owner of a code segment is recorded here This allows the system todetermine which process owns any segment of code when swapping occurs code owners
= code ... other processes, so the con-stant devprocqueue denotes the queue of highest-priority processes System processes must be preferred by the scheduler to user processes but should be pre-empted by ... LowLevelScheduler It is defined as follows The scheduler has three queues (readyqs), one each for device, system and user process (in that order) It is worth noting that the process queues are all contained

Ngày tải lên: 23/07/2014, 23:20

... the nl command to ber the lines of the files: num-$ echo UNIX > os # create a file $ nl os 1 UNIX $ perl -i.bak -wnl -e 's/UNIX/Linux/g;' os # original os -> os.bak $ nl os # original ... is intact 1 UNIX # Now for the misguided 2nd run—in the spirit of a # "Hail Mary pass"—in a vain attempt to fix the "os" file: $ perl -i.bak -wnl -e 's/UNIX/Linux/g;' os # ... nicknames, including “Queen of UNIX Utilities” and “Jewel in theCrown of UNIX.” But it’s no ivory-tower sissy, as reflected by its most macho moni-ker, “Swiss Army Knife of UNIX.” But what is AWK? Like

Ngày tải lên: 06/08/2014, 03:20

... Unix system is installed is a 16-bit word (8-bit byte) com-puter with 768K bytes of core memory; the system kernel occupies 90K bytes about equally divided between code and data tables This system, ... the PWB/UNIX systems [4, 5], for example There are also much smaller, though somewhat restricted, versions of the system [6] Our own PDP-11 has two 200-Mb moving-head disks for file system storage ... Removable file systems Although the root of the file system is always stored on the same device, it is not necessary that the entire file system hierarchy reside on this device There is a mount system

Ngày tải lên: 12/09/2012, 15:05

... ra (I/O subsystem) Chương VI Đa xử lí (Multiprocessor Systems) Chương VII Các hệ Unix phân tán (Distributed Unix Systems) Phần 2: Lập trình trong Unix Phần 3: Lập trình mạng trong Unix Trang ... Trang 2Phần 1: Lí thuyết HĐH Unix/LinuxMục lục A Tổng quan: Vài nét về Hệ Điều hành B Unix/Linux Chương I Tổng quan hệ thống Unix Chương II Hệ thống tệp (file subsystem) 1 Tổng quan về Hệ thống ... phần cứng khác nhau Đơn giản, nhất quán, đó là tư tưởng chủ đạo của Unix II Unix/Linux 1 Cấu trúc hệ thống Cấu trúc của Unix Unix có thể xem như một loại kim tự tháp với các lớp chức năng xếp

Ngày tải lên: 05/11/2012, 11:57

... (File System) 4 Quản lý nhập xuất (I/O) 5 Quản lý thiết bị lưu trữ (Secondary-storage) 6 Quản lý mạng (Networking) 7 Hệ thống bảo vệ (Protection System) 8 Hệ thông dịch lệnh (Commander-Intpreter System) ... Trang 1PHẦN 2: HỆ ĐIỀU HÀNH (OPERATING SYSTEM) Chương 1: Tổng quan Hệ điều hành Đáp án 1 Tổ chức, quản lý và phân phối tài nguyên ... (Program execution) 3 Tổ chức và quản lý xuất nhập (I/O operations) 4 Quản lý hệ thống File (File-system manipulation) 5 Truyền tin (Communications) 6 Xác định và xử lý lỗi (Error detection) 7 Các

Ngày tải lên: 19/10/2013, 18:15

... Portable Operating System Interface for Unix, is a standarddeveloped so that buyers (particularly the U.S government) could be assured of purchasing programs that ran on a variety of systems and ... designed to run on any POSIX-compliant operating system, which includes most variants of Unix. File Organization The BeOS, like the Mac OS, Windows, and Unix, organizes files hierarchically Files, ... BFile class But Be also tips its hat to Unix programmers by supporting standard POSIX file functions such as open(), close(), read(), and write() If you have a Unix programming background, you’ll

Ngày tải lên: 20/10/2013, 10:15

... adaptive control method of partially known system and shows its application result to control of a two-wheeled welding mobile robot The controlled system is designed using Lyapunov stability ... Trang 1đIều khiển thích ứng hệ thống xác định một phần Adaptive Control of Partially Known System Nguyễn Tấn Tiến *, Hoàng Đức Liên** và Kim Sang Bong*** *Khoa Cơ Khí, Đại học Bách khoa ... effectiveness of the proposed controller is shown through simulation results Keyword: partially known system, Welding Mobile Robot(WMR), tracking, welding path reference 1 Giới thiệu Robot di động

Ngày tải lên: 10/12/2013, 13:16

... Then the Operating systems boots and eventually reaches the graphical user Before upgrading you should backup the ini files, confirm that your hardware is compatible with the new operating system, ... Control panel, system, performance, graphics B Control panel, system, display settings, graphics C Control panel, system, device manager, properties, graphics D Control panel, system, hardware ... the system only began running slowly after the installation of the new application Trang 18QUESTION NO 43 How can you get a point out of the system configuration on a Windows 9x operating system?

Ngày tải lên: 11/12/2013, 14:15

... needs an Operating System At the most basic level an Operating System (OS) is the interface between you, your software applications, and your computer hardware Functions Operating Systems interpret ... and bringing down the whole system OS/2, and POSIX-compliant systems (a UNIX standard) Also able to provide full connectivity on a network with Apple, Novell, Banyan, UNIX, and IBM machines according ... Computer System Interface settings for SCSI controllers, tape drives (if you have a SCSI host adapter) • Services - starts, stops and pauses various services • System - system startup settings, system

Ngày tải lên: 11/12/2013, 15:15