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8: Installing and Managing Software on Linux
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FIGURE 8-6
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Searching for software on the SourceForge Web site
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FIGURE 8-7
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Viewing source file checksum values
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Install Software on Linux
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SCENARIO & SOLUTION
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You need to install an RPM package named barcode on your Linux system Where could you look to find this software You ve just downloaded a file named SUSE-Linux-101Remastered-i386-CD2iso What command would you use to generate a checksum value on the file You could look on your distribution s installation CD For a more updated version, you could visit http:// wwwrpmfindnet or http://sourceforgenet You would change to the directory where the file resides and then enter sum SUSE-Linux-101Remastered-i386-CD2iso
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However, if the checksums are different, that indicates that somehow the two copies of the file are different in some way More than likely, something happened during the download process that corrupted the local copy In this situation, don t try to salvage the local copy Delete it and download a new copy and verify the checksum values again Let s practice using Web resources to obtain Linux software in the following exercise
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EXERCISE 8-1
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ON THE CD
Using Web Resources to Obtain Linux Software
In this exercise, you will practice using Web resources to download Linux software The following steps were accurate as of the time this book was written Because of the ever-changing nature of the Web, you may need to modify these steps as new versions of software are released and Web sites are updated With this in mind, complete the following: 1 Boot your Linux system and log in as a standard user If you used the lab exercise in 3 to install your system, you can log in as tux with a password of M3linux273 2 Open a Web browser and navigate to http://wwwsourceforgenet 3 In the Search field on the SourceForge home page, enter pure-ftpd, then select Search
8: Installing and Managing Software on Linux
4 Locate the Pure-FTPd Download link in the list of search results and select it 5 In the list of latest file releases, select the Download link for the latest version of Pure-FTPd in targz format 6 Save the file to your home directory (~) (Your browser may prompt you to open the file with a graphical archive utility Don t select this option) 7 In your browser, navigate to http://wwwrpmfindnet/linux/RPM 8 Scroll down to the Search field and enter gftp, then select Search 9 In the list of search results identify the appropriate RPM package for your distribution and architecture 10 Select the appropriate link to download the correct RPM for your system and save the file to your home directory 11 Close your browser window Now you re ready to start installing files Let s review how this is done next
Installing Software from Source Code
Many of the applications and services you will install on a Linux system will be delivered as source code, not as a binary executable When you install the software on your local system, you actually compile the source code from the installation files into a binary executable that can be run For example, let s suppose you wanted to install and configure an FTP service on your local Linux system You ve done some research and determined that the pure-ftpd service is the one you want to use to set up your FTP server When you download and extract the installation files, you notice that a directory named src is created Within this directory are a number of text files that contain the source code for the pure-ftpd service An example of one of the source code files for this service is shown in Figure 8-8 Distributing software in this manner has many advantages Key among these is the fact that you don t have to create a separate executable and installation package for each delivery architecture and platform You can have the installation process detect the type of system the software is being installed on and compile the software appropriately The key disadvantage to this approach is the fact that it makes the installation process somewhat complex Users must have a compiler installed on
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