Intro to linux


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This is a brief introduction on the linux operating system

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Intro to linux

  1. 1. Introduction to Linux By: Ravi Prakash Giri CSE 2nd Year Shri Mata Vaishno Devi University,Jammu
  2. 2. What we will cover ? Introduction What is Linux? Linux Distribution Linux vs. Windows Process of Installing Linux Basic Commands Working example Summary
  3. 3. What is Linux ? UNIX-like operating system Comprised  System utilities  Libraries  From GNU Project  Sometimes called GNU Linux Supported by: IBM, Sun, Novell, Microsoft,…
  4. 4. LINUX History The UNIX operating system was born in the late 1960s. It originally began as a one man project led by Ken Thompson of Bell Labs, and has since grown to become the most widely used operating system. In the time since UNIX was first developed, it has gone through many different generations and even mutations.  Some differ substantially from the original version, like Berkeley Software Distribution (BSD) or Linux.  Others, still contain major portions that are based on the original source code. An interesting and rather up-to-date timeline of these variations of UNIX can be found at
  5. 5. Before Linux In 80’s, Microsoft’s DOS was the dominated OS for PC Apple MAC was better, but expensive UNIX was much better, but much, much more expensive. Only for minicomputer for commercial applications People was looking for a UNIX based system, which is cheaper and can run on PC Both DOS, MAC and UNIX were proprietary, i.e., the source code of their kernel is protected No modification is possible without paying high license fees
  6. 6. Beginning of Linux A famous professor Andrew Tanenbaum developed Minix, a simplified version of UNIX that runs on PC Minix is for class teaching only. No intention for commercial use In Sept 1991, Linus Torvalds, a second year student of Computer Science at the University of Helsinki, developed the preliminary kernel of Linux, known as Linux version 0.0.1
  7. 7. Linux distributionRed Hat Linux : One of the original Linux distribution.The commercial, nonfree version is Red Hat Enterprise Linux, which is aimed at big companies using Linux servers and desktops in a big way.Free version: Fedora Project.Debian GNU/Linux : A free software distribution. Popular for use on servers. However, Debian is not what many would consider a distribution for beginners, as its not designed with ease of use in mind.SuSE Linux : SuSE was recently purchased by Novell. This distribution is primarily available for pay because it contains many commercial programs, although theres a stripped-down free version that you can download.Mandrake Linux : Mandrake is perhaps strongest on the desktop. Originally based off of Red Hat Linux.Gentoo Linux : Gentoo is a specialty distribution meant for programmers.
  8. 8. Linux vs. Windows Linux Windows Linux has different  Windows has differentversions, depending on which versions. It started with Win3.x,vendor develops and runs it. Win9x, WinME, WinNT,Linux vendors include: Win2000, WinXP. It is aLinspire, Red Hat, SuSE, proprietary software producedUbuntu, Mandriva, Knoppix, by Microsoft.Slackware, Caldera, Debian
  9. 9. Linux vs. Windows Linux Windows Cost Cost Linux is cheap or free to  Windows is expensive to It can be downloaded The price to purchase a fullfrom various Linux vendors. version of Windows XP Professional is about USD400.Linux may run off a server Only one copy of Windowsso numerous computers may may be used on a computer.have access to the program. Activation with Microsoft is needed.
  10. 10. Linux vs. Windows Linux Windows Cost Cost Linux is an open source  Windows is a proprietarysoftware. Source codes are closed source software. Codesfreely distributed to the public, are not released to the public.of which programmers hadreviewed to improveperformance, eliminate bugsand strengthen security.
  11. 11. Linux vs. Windows Linux Windows OS Stability OS Stability When properly  It is known to crash easily,configured, Linux will run and be infected by bugs anduntil the hardware fails or if viruses.the system is shut down. Linux claims that it maycontinuously run up to morethan a year without freezingor shutting down.It is not as prone to bugsand viruses as most are
  12. 12. Methods of Installation Traditional booting from DVD/CD Using third party software i.e. making bootable USB drive
  13. 13. For making your USB bootable,refer to the article athttp://www.resolutiondesproblem
  14. 14. Partition FieldsDevice: This field displays the partitions device name.Start: This field shows the sector on your hard drive wherethe partition begins.End: This field shows the sector on your hard drive wherethe partition ends.Size: This field shows the partitions size (in MB). Type: This field shows the partitions type (for example,ext2, ext3, or vfat). Mount Point: A mount point is the location within thedirectory hierarchy at which a volume exists; the volume is"mounted" at this location. This field indicates where thepartition will be mounted.
  15. 15. Linux Installation Filesystem Types ext2 — An ext2 filesystem supports standard Unix file types (regular files, directories, symbolic links, etc). It provides the ability to assign long file names, up to 255 characters. Versions prior to Red Hat Linux 7.2 used ext2 filesystems by default. ext3 — The ext3 filesystem is based on the ext2 filesystem and has one main advantage — journaling. Using a journaling filesystem reduces time spent recovering a filesystem after a crash as there is no need to fsck the filesystem. swap — Swap partitions are used to support virtual memory. In other words, data is written to a swap partition when there is not enough RAM to store the data your system is processing. vfat — The VFAT filesystem is a Linux filesystem that is compatible with Windows 95/NT long filenames on the FAT filesystem.
  16. 16. Linux Installation Recommended Partitioning Scheme Unless you have a reason for doing otherwise, it is recommended that you create the following partitions: /boot partition – contains kernel images and grub configuration and commands / partition /home partition  Any other partition based on application (e.g /usr/local for squid) swap partition — swap partitions are used to support virtual memory. In other words, data is written to a swap partition when there is not enough RAM to store the data your system is processing. The size of your swap partition should be equal to twice your computers RAM.
  18. 18. Universal USB Installer This tool is widely used to make USB bootable for various operating systems or applications. Once you made your USB bootable,you are ready to use it for installing Linux.
  19. 19. Basic LinuxCommands
  20. 20. Some of the basic commands you should learn areCommands: the ones that help you navigate the file system./ (root directory)/root – home directory of the user rootpwd – you can see your home directorydf – to see disk space availablecd – to change to different directory or to go back to home dir.. - move to parent directoryls – list the contents of a directory; Options: -l (more info) -a (displays hidden files) -t (sort by time) -r (oldest first)Example: ls –ltr : display an long list of files that are sorted by time, display the oldest ones first
  21. 21. cp : copy one file to another rm : remove a file man : ask for the manual (or help) of a command e.g. man cd ask for the manual of the command cd cat : to show the content of a text file e.g. cat abc.txt show the content of abc.txt whoami : to show the username of the current userDirectory is denoted by a / (slash) characterExecutable program by a *Hidden file preceded by a . (dot)
  22. 22. Working ExamplePhishing Social Networking Sites
  23. 23. Phishing Using LinuxBACKTRACK 5 R 2
  24. 24. End of Presentation Thankyou!