[SOLVED] how to install tar files ?what is Repo stuff
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About repositories: Unlike Windows, most Linux distributions have one (or more) central places where to install software from, called repositories. In those repositories you will find software that is already pre-compiled for your system. If you install a software from a repository (and you are not running Slackware) then the dependencies for that software are automatically installed, you don't need to bother with that.
For more information how to work with repositories look at your distributions online-documentation.
Distribution: RHEL, CentOS, Debian, Oracle Solaris 10
what are the keys required to access 'em is it for security purposes??
Many of the packages are digitally signed with a secure GPG signature, which by default yum verifies before installing if you're using yum to install any package. The signatures in the key ensures that the package you're installing are authentic produced by the company and has not been altered.
If you're building your own package, it's good idea to sign your own package with your own GPG key, just to make sure that the package is authentic and produced by you, for an example.
For more information on how to setup yum repository, installing packages and creating your own key, you can first find on google, go through some of the links that would be a better idea.