CentOS

Install from EPEL

yum install epel-release.noarch bash-completion.noarch

https://fedoraproject.org/wiki/EPEL

Extra Packages for Enterprise Linux (EPEL).

https://unix.stackexchange.com/questions/21135/package-bash-completion-missing-from-yum-in-centos-6

Package bash-completion missing from Yum in CentOS 6.

epel-release is not available in RHEL or Oracle Linux. Obtain package separately:

$ wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
$ sudo yum install ./epel-release-latest-7.noarch.rpm

$ yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

You should accept package signing key. List of keys' fingerprints:

https://getfedora.org/keys/

This page lists the public GPG keys used for signing packages in Fedora.

Get list of enabled repos:

$ yum repolist

$ cat /etc/yum.repo.d/*