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/usr/bin/yum makecache
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$ yum clean all
$ yum list updates
but doesn't explain why it downloads a lot more metadata than than various other options or why you'd want to use it and I haven't been able to find an explanation anywhere else. So given that it is evidently not required to run "yum makecache" what is the purpose of it? Under what circumstances would it be (at least potentially) useful to use it? I've been using yum on various distros for a long time, I don't recall even noticing makecache until now.Is used to download and make usable all the metadata for the currently enabled yum repos.