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Now that you know how to start Linux and access the root user, you can install any other software packages you may want. Installing software is an administrative function performed by the root user. Unless you chose to install all your packages during your installation, only some of the many applications and utilities available for users on Linux were installed on your system. Red Hat uses the Red Hat Package Manager (RPM) to organize Linux software into packages you can automatically install or remove. An RPM software package operates like its own installation program for a software application. A Linux software application often consists of several files that must be installed in different directories. The program itself is most likely placed in a directory called /usr/bin, online manual files go in another directory, and library files in yet another directory. In addition, the installation may require modification of certain configuration files on your system. The RPM software packages on your Red Hat CD-ROM perform all these tasks for you. Also, if you later decide you don't want a specific application, you can uninstall packages to remove all the files and configuration information from your system (see 19 for more details). The RPM packages on your CD-ROMs represent only a small portion of the software packages available for Linux. You can download additional software in the form of RPM packages from distribution sites, such as ftp.redhat.com for Red Hat packages. In addition, these packages are organized into lib5 and lib6 directories: lib5 refers to the packages using the older libraries, whereas lib6 refers to those using the new GNU 2.x libraries. For Red Hat 7.0, you should use the lib6 versions, though lib5 versions also work. An extensive repository for RPM packages is located at http://rpmfind.net/. Packages here are indexed according to distribution, group, and name. This includes packages for every distribution, including previous versions of those distributions. You can also locate many of the newest Linux
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applications from http://freshmeat.net or www.linuxapps.com. Here, you can link to the original development sites for these applications and download documentation and the recent versions. Table 4-3 lists several Linux software sites. Table 4-3: Linux Software Sites Description Linux software repository New Linux software RPM package repository Mirror site for Linux software and distributions Red Hat Linux and updates Source Forge Opensource software repository and development site KDE software applications Gnome software applications
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Internet Site www.linuxapps.com freshmeat.net rpmfind.net metalab.unc.edu ftp.redhat.com sourceforge.net apps.kde.com www.gnome.org
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On Gnome, you can use GnomeRPM to install RPM packages. Select the GnomeRPM entry in the Gnome main menu under Systems. With GnomeRPM, you can locate packages on your file system. Choose the packages you want to install. GnomeRPM lists packages already installed. You can select them to view their details and file list. Problems can occur if the package requires that another package be installed or updated first. This is often the case where an application may need an updated version of a shared library. In this case, you will be notified of the problem and asked if you want to proceed. You can cancel at that time, and then locate and install any packages that are required first.
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Red Hat also posts all updates in its update directory at its FTP site at ftp.redhat.com. You can simply download updates directly from the FTP site and install them manually. You can use an FTP client, such as ncftp, to download them all at once, including any subdirectories (see 19). Then change to that directory and use the rpm -Uvh command to install the packages. U will update a previously installed package, v specifies a verbose install, and h will display hatch symbols across the screen to show the install progress. See the following section for a more detailed explanation of RPM packages and how they work. RPM update packages are kept in the Red Hat update site at ftp.redhat.com and its mirror sites. You can access the site, locate the updates for your distribution version, and then download them to your system. Then you can install them using an RPM utility, such as GnomeRPM, or the rpm command using the update option, -U. Perhaps the easiest way to do this is to use the Gnome file manager to download the files first. First, open a file manager window and enter the URL for the Red Hat update site in its location box. Then access the update site. Within that directory, move to the current directory, where you can see a list of all the updates. Download any new updates or all of them if this is the first update for your version. To download, open another file manager window and create a new directory to hold
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your update. Now open that directory. Then select and drag the update files from the file manager window for the update site to that new directory. You may not need all the files. In the case of kernel updates, you only need the kernel file for your processor: i386, i586 (Pentium), or i686 (Pentium II). As files are downloaded, a dialog box displays the filename and the percentage downloaded. Once the update is downloaded, you can open a Terminal window and change to that new directory. You open a Terminal window by clicking the Monitor icon in the panel. Then use the cd command to change to that directory. If the directory name is redup, you would enter
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