How to check and list installed packages in CentOS Linux

Originally published at: https://www.cyberciti.biz/faq/check-list-installed-packages-in-centos-linux/

How do I check installed packages in CentOS Linux version 6.x/7.x/8.x? How can I List installed packages on CentOS Enterprise Linux server?

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Execute either one of the following

yum list installed

or

rpm -qa
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