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shell
Adding a config file is a game changer. Makes it much easier than having to type complex command lines with easy to forget flags.
Environment variables are a set of dynamic named values that can affect the way running processes will behave on a computer.
This is the one I installed in the 90's on my home machine, and used in conjunction with fetchmail to retrieve messages over POP. Always the rebel, I had to try something besides mail and pine, and elm seemed too similar to both.
