In its simplest form, RPM can be used to install packages:
rpm -i foobar-1.0-1.i386.rpm
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The next simplest command is to uninstall a package:
rpm -e foobar
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One of the more complex but highly useful commands allows you to install packages via FTP. If you are connected to the net and want to install a new package, all you need to do is specify the file with a valid URL, like so:
rpm -i ftp://ftp.redhat.com/pub/redhat/rh-2.0-beta/RPMS/foobar-1.0-1.i386.rpm
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Please note, that RPM will now query and/or install via FTP.
While these are simple commands, rpm can be used in a multitude of ways. To see which options are available in your version of RPM, type:
rpm --help
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You can find more details on what those options do in the RPM man page, found by typing:
man rpm
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