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Removing RPM Software Packages
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To remove a software package from your system, first use rpm -q to make sure it is actually installed Then use the -e option to uninstall it You needn t use the full name of the installed file; you only need the name of the application For example, if you decide you do not need Gnumeric, you can remove it using the -e option and the software name, as shown here:
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# rpm -e gnumeric
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You can use the verify option (-V) to see if any problems occurred with the installation RPM compares the current attributes of installed files with information about them placed in the RPM database when the package was installed If no discrepancies exist, RPM outputs nothing Otherwise, RPM outputs a sequence of eight characters, one for each attribute, for each file in the package that fails Those that do not differ have a period Those that do differ have a corresponding character code, as shown in Table 10-5 The following example verifies the ProFTPD package:
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[root@turtle mypackages]# rpm -V proftpd
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Attribute 5 S L T D U G M TABLE 10-5 RPM Discrepancy Codes
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Explanation MD5 checksum File size Symbolic link File modification time Device User Group Mode (includes permissions and file types)
To compare the installed files directly with the files in an RPM package file, you use the -Vp option, much like the -qp option To check all packages, use the -Va option as shown here:
# rpm -Va
If you want to verify a package, but you only know the name of a file in it, you can combine verify with the -f option The following example verifies the RPM package containing the ftp command:
# rpm -Vf /bin/ftp
PART IV
Rebuilding the RPM Database
RPM maintains a record of the packages it has installed in its RPM database You may, at times, have to rebuild this database to ensure RPM has current information on what is installed and what is not Use the --rebuilddb option to rebuild your database file:
# rpm --rebuilddb
To create a new RPM database, use the --initdb option This option can be combined with --dbpath to specify a location for the new database
Debian
Among most Linux distributions, there are basically two major software packaging, RPM and DEB, used primarily in the Debian and Ubuntu distributions The DEB format is much more capable than its RPM counterpart For, example, a Debian package will automatically resolve dependencies, installing any other needed packages instead of simply reporting their absence, like RPM does Debian also uses a different package naming format than RPM Packages are named with the software name, the version number, and the deb extension Check debian org/doc for more information
Part IV:
Linux Software
Two basic package managers are available for use with Debian packages: the Advanced Package Tool (APT) and the Debian Package tool (dpkg) For APT, you use the apt-get tool to manage your packages apt-get can even download packages as well as compile source code versions for you The apt-get tool takes two arguments: the command to perform and the name of the package Other APT package tools follow the same format The command is a term such as install for installing packages or remove to uninstall a package To install the kernel image package you would use:
apt-get install kernel-image-2621deb
Upgrading is a simple matter of using the upgrade command With no package specified, apt-get with the upgrade command will upgrade your entire system, downloading from an FTP site or copying from a CD-ROM and installing packages as needed Add the -u option to list packages as they are upgraded
apt-get -u upgrade
You can even upgrade to a new release with the dist-upgrade command
apt-get -u dist-upgrade
There are several popular front ends for apt-get that let you manage your software easily, like synaptic, gnome-apt, aptitude, and deselect Configuration for APT is held in the /etc/apt directory Here the sourceslist file lists the distribution repositories from where packages are installed Source lists for additional third-party repositories (like that for Wine) are kept in the /etc/sourceslistd directory GPG database files hold validation keys for those repositories Specific options for apt-get are kept in either an /etc/aptconf file or in various files located in the /etc/aptconfd directory You can also use the dpkg tool to manage software, though it is used primarily to obtain information about a package Its more complex version, dpkg-deb, is used to construct Debian packages The dpkg configuration files are located in the /etc/dpkg directory Configuration is held in the dpkgcfg file and sources in the origins directory
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