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Uninstalling RPM Packages
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As with installing RPM packages, the process for uninstalling them is relatively easy and straightforward To do this, enter rpm e package_name at the shell prompt The e option tells the rpm utility to erase the specified package For example, in Figure 8-19 we installed the armegetron-0271-38i586rpm package using rpm We could uninstall this same package by entering rpm e armagetron at the shell prompt
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8: Installing and Managing Software on Linux
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Uninstalling software using the make uninstall command
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Be warned that the rpm utility checks dependencies during uninstall as well as install operations If other software is installed on the system that is dependent on the package you are trying to uninstall, an error message will be displayed listing the dependent packages You must first uninstall those packages before you can continue
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You need to uninstall an application that was originally installed from source code on your system You ve run /configure in the installation directory What command do you need to run next You need to uninstall a package named BitTorrent from your system What command would you use to do this You need to run make uninstall from the installation directory
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You would enter rpm e BitTorrent at the shell prompt
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Let s practice uninstalling an RPM package in the following exercise
EXERCISE 8-4
ON THE CD
Uninstalling RPM Packages
In this exercise, you will practice uninstalling the gftp client you installed in the previous exercise Complete the following: 1 With your system running, open a terminal session 2 If necessary, change to your root user account by entering su followed by your root user s password 3 At the shell prompt, enter rpm e gftp You should see a message indicating that gftp has been erased Let s next discuss how you can update RPM packages
Updating Software
The ability of the rpm utility to manage dependencies is a real time-saver However, it brings up the issue of updates What if you have a package installed that needs to be updated, but it has many other packages that are dependent on it Do you have to uninstall all of them before you can update the package That would be a real pain! Fortunately, this isn t the case The rpm utility can be used to update an existing package without having to uninstall all of its dependent packages This is done using the U option with rpm Using this option, the rpm utility will remove any existing older packages and then install a newer version of the package For example, suppose you had an older version of gftp installed on your system and wanted to upgrade to version 2018 To do this, you would enter rpm U gftp-2018-23i586rpm at the shell prompt Let s now discuss how you can query packages installed on your system
Querying Packages
In addition to installing and upgrading packages on your system, the rpm command can also be used to query packages for information This can be done using the q (for query) option with rpm Using the q option, you can list all the packages
8: Installing and Managing Software on Linux
installed on the system, view the version and release number of a specific package installed on the system, or view details about a package The q option requires that you specify exactly what you want to query For example, if you want to generate a list of all packages installed on the system, you would enter rpm qa A list of installed packages will then be displayed on the screen This is shown in Figure 8-24 Be warned that the list will probably be very long! If you need information about a specific package, you can use the following options with q:
i
This option displays summary information about a specific package For example, in Figure 8-25, the rpm qi postfix command has been issued at the shell prompt to display information about the postfix package installed on the system This option displays a list of packages that require the specified packages For example, entering rpm q --whatrequires postfix will display a list of packages that require the postfix package
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