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yum is a command line program. man yum provides the local documentation. The basic operations are its setup, checking for updates, and finally, looking for and installing a specific package.

Setup is a necessary precursor to using Yum. The operation downloads all the headers for all the packages, so don't do it without thought. It will take some time to complete. Consider doing this when network traffic is low.

The setup command is yum check-update. This step loads onto your system the headers of the packages, which can be up to 30 or 40 megabytes of data. This is an operation that is necessary, but only needs to be done once. After this operation, this list is updated with each update you get.

Next, get any needed updates. The command is yum update. This command causes yum to compare the headers you downloaded above with those on the server and offer to update your system. A simple y response is enough to cause yum to fetch the updates, then to install them on your system.

Finally, if you need to run command X, and you try it, and it isn't installed, you can tell yum to get it for you and install it. For example:

yum install cvs

yum connects to the server, finds the named package, retrieves it, and installs it automatically.

Refer to Appendix A, References for references and another HOWTO on Yum.