List yum repos that have packages installed and are still defined
yum repolist all $( yum list installed | awk '$NF ~ /@/ && $NF !~ /anaconda/ {split($NF,a,"@");print a[2];}' | sort | uniq ) | awk 'NR > 2 && $1 !~ /repolist/ {split($1,a,"/");print a[1]}'
The idea is to list each installed package which also lists the repo it was installed from, and then organize those repos. Then list them and show the ones that are still defined in yum's repository files.
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