fdupes from systemsmanagement:saltstack:products:testing project
Select Your Operating System
Add repository and install manually
For CentOS 8 run the following as root:
cd /etc/yum.repos.d/ wget https://download.opensuse.org/repositories/systemsmanagement:saltstack:products:testing/CentOS_8/systemsmanagement:saltstack:products:testing.repo yum install fdupes