I ran into this issue today and couldn't find a great solution online. Needed to combine multiple key/value files, like .ini or .env, and have some values over

I ran into this issue today and couldn't find a great solution online. Needed to combine multiple key/value files, like .ini or .env, and have some values override others while removing duplicates. This script + example demonstrates how to use awk to remove duplicate lines based on their key.