If you need to migrate to a new computer and want to install the same packages that were on your old computer on the new one, the following pipes all the packages into a list that you can then use to install on the new computer.
rpm -qa --qf "%{NAME}\n" > filelist.txt
Then to install the packages
yum -y install `cat filelist.txt`
or
yum -y install $(cat filelist.txt)
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