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This will remove the gpg-pubkey-1aa043b8-53b2e946 from rpm/yum and you'll be prompted to add it back from the given repo.
This will list all the gpg keys that were accepted and installed for yum.
'yum deplist XXX' provides a list of packages that XXX depends on.
This command provides a list of packages that depend upon XXX (package reverse dependencies)
This probably only works without modifications in RHEL/CentOS/Fedora.
How to list just one repo with yum. First I disable all repo, second I enable just the repo that I want to list.
It displays, last 15 yum operations (in last operation as first row order) with its dates. Change 15 to any number of operations you need to display or remove "| tac" to see it in reverse order (last operation as last row)