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You can update your Linux system automatically using a distribution update agent like the Red Hat Network. You can also manually download packages using an FTP client, web browser, or the Gnome or KDE file managers, and then use the rpm command or the redhat-config-packages tool to install the software. For redhat-config-packages, you can use your file manager to locate the RPM file and double click the RPM package file. You can also, on Gnome, right-click it, and select Open With | Install Packages, or on KDE, select Install Package. redhat-config-packages starts up and checks for any dependent packages you may need. It then installs the RPM package for you. If you are using the rpm command, use the -U option to upgrade packages. In the following example, the rpm command with the -Uvh option installs an upgrade for emacs: # rpm -Uvh emacs-21.2-18.i386.rpm
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If you do not have access to the desktop, or you prefer to work from the command-line interface, you can use the rpm command to manage and install software packages. rpm is the command that actually performs installation, removal, and queries of software packages. In fact, redhat-config-packages uses the rpm command to install and remove packages. An RPM package is an archive of software files that includes information about how to install those files. The filenames for RPM packages end with .rpm, indicating software packages that can be installed by the Red Hat Package Manager.
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With the rpm command, you can maintain packages, query them, build your own, and verify the ones you have. Maintaining packages involves installing new ones, upgrading to new versions, and uninstalling packages.
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The rpm command uses a set of options to determine 3 what action to take. In addition, certain tasks, such as installing or querying packages, have their own options that further qualify the kind of action they take. For example, 3 the -q option queries a package, but when combined with the -l option it lists all the files in that package. Table 3-3 lists the set of rpm options. The syntax for 3 the rpm command is as follows (rpm-package-name is the name of the software package you want to install):
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rpm options rpm-package-name
Mode of Operation rpm -ioptions package-file rpm -eoptions package-name rpm -qoptions package-name Effect Installs a package; the complete name of the package file is required. Uninstalls (erases) a package; you only need the name of the package, often one word. Queries a package. An option can be a package name, a further option and package name, or an option applied to all packages. Upgrades; same as install, but any previous version is removed. Upgrades, but only if package is currently installed. Verifies a package is correctly installed; uses same options as query. You can use -V or -y in place of -verify. Displays percentage of package during installation. Installs an already installed package. Replaces files installed by other packages. Searches for dependent packages. Installs an older version of a package already installed. Tests installation; does not install, only checks for conflicts. Displays # symbols as package is installed. Excludes documentation files.
rpm -Uoptions package-name rpm -Foptions package-name rpm -verifyoptions
--percent --replacepks --replacefiles --redhatprovides dependent-files --oldfiles --test -h --excludedocs
Table 3-3.
Red Hat Package Manager (RPM) Options
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Mode of Operation --nodeps --force Uninstall Options (to be used with -e) --test --nodeps --allmatches Query Options (to be used with -q) package-name -qa -qf filename -qR -qp package-name -qi -ql -qd Effect Installs without doing any dependency checks (dangerous). Forces installation despite conflicts (dangerous).
Tests uninstall. Does not remove, only checks for what is to be removed. Uninstalls without checking for dependencies. Removes all versions of package.
-qc -q --dump General Options (to be used with any option) -vv Debugs; displays descriptions of all actions taken. --quit Displays only error messages. --version Displays rpm version number. --help Displays detailed use message. --rootdirectory Uses directory as top-level directory for all operations (instead of root). --dbpathdirectory Uses RPM database in the specified directory. --dbpath cmd Pipes output of RPM to the command cmd. --rebuilddb Rebuilds the RPM database; can be used with the -root and -dbpath options.
Queries package. Queries all packages. Queries package that owns filename. List packages on which this package depends. Queries an uninstalled package. Displays all package information. Lists files in package. Lists only documentation files in package. Lists only configuration files in package. Lists only files with complete details.
Table 3-3.
Red Hat Package Manager (RPM) Options (continued)
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