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1: Introducing Linux
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On the right side of the menu button, the taskbar also includes shortcut icons used to launch commonly used applications Next to these buttons is a panel where icons for active applications are displayed In Figure 1-15, OpenOfficeorg has been launched on the desktop A corresponding icon appears in the taskbar On the far right side of the taskbar are system applets that allow you to control such things as the audio volume level and update downloads The system clock is also displayed
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1: Introducing Linux
CERTIFICATION SUMMARY
In this chapter, you were introduced to the Linux operating system We first discussed what an operating system is We also discussed the components that comprise the Linux operating system We emphasized the fact that modern computer systems and operating systems are modular You can install Linux on any compatible computer We then spent some time reviewing the historical development of Linux We reviewed the typical corporate software development model and related how Linux was developed outside this norm We talked about GNU and the GPL We discussed the fact that Linux is developed under the GPL, allowing anyone free access to the source code We reviewed how Linux distributions are created and reviewed several of the more popular distributions We also discussed the different roles that Linux can play in a typical organization, including servers, desktops, and firewalls We finished this chapter by reviewing the two user interfaces provided by most Linux distributions: the command-line interface and the graphical user interface
Two-Minute Drill
TWO-MINUTE DRILL
Describe the Background and History of Linux
Linux is an operating system Operating systems provide four key functions: Application platform Hardware moderator Data storage Security Linux is composed of the following components: Kernel Libraries Utilities User interfaces Linus Torvalds first developed Linux in the early 1990s Linux is licensed under the GPL Anyone can download and modify the Linux kernel source code Different software companies develop unique Linux flavors called distributions Linux can function as a server, desktop system, or firewall in a computer
network
Use the Linux User Interface
Linux offers a command-line and a graphical user interface The Linux command-line interface is created by shells The bash shell is the default shell for most distributions Linux shells do not search the current directory when running a file from the
command prompt
The Linux GUI is composed of the following components: X Window System Window manager GUI toolkit Desktop environment
1: Introducing Linux
SELF TEST
Describe the Background and History of Linux
1 Which of the following are applications (Choose two) A B C D E Linux MySQL VMware DOS Active Directory
2 Your company recently purchased 12 new computer systems The computers have Intel Pentium IV 25 GHz CPUs and 40MB hard drives Your supervisor wants to install Linux on them, but is concerned that it can t be done because they already have Windows XP Professional installed Can this be done A Yes, but you must install a new hard drive for Linux B No, Windows is embedded in the system hardware You must purchase systems without an operating system installed C No, modern motherboards are hard-coded to recognize your Windows Certificate of Authority If it doesn t find this, the system won t boot D Yes, you can erase the hard drive and install Linux 3 Which of the following is the true operating system component within Linux A B C D A B C D E Linux libraries Linux kernel X Window System bash shell Linux kernel X Window System bash shell Linux libraries Window manager
4 Which of the following provides pre-written code that programmers can use in Linux programs
5 What was the name of the UNIX clone written by Andrew Tanenbaum A CPM B DR-DOS
Self Test
C D E F A B C D E A B C D
Linux Minix Solaris AIX He sold it to IBM He gave it to Microsoft for free He developed Minix He patented and copyrighted it He posted it on the Internet for anyone who wanted a copy Richard Stallman Andrew Tanenbaum Linus Torvalds Richard Berkley
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