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What is the use of the following command?
$ sudo yum clean all
$ sudo yum update
$ sudo yum clean all
$ sudo yum update
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$ sudo yum clean all
> The command "yum clean" clears the cache of repositories that have been enabled in /etc/yum. repos. In the commands below, "all files" refers to "all files in presently enabled repositories." Use the —enablerepo='*' option if you wish to clean any (temporarily) disabled repositories as well.
$ sudo yum update
> "yum update" brings all currently installed packages up to date with the latest versions available in the repository.
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