Unix & Linux: make wget refer to a local copy without redundantly downloading files

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With thanks & praise to God, and with thanks to the many people who have made this project possible! | Content (except music & images) licensed under cc by-sa 3.0 | Music: https://www.bensound.com/royalty-free-music | Images: https://stocksnap.io/license & others | With thanks to user slm (https://unix.stackexchange.com/users/7453), user Nidal (https://unix.stackexchange.com/users/45764), user Guy Shepherd (https://unix.stackexchange.com/users/72005), and the Stack Exchange Network (http://unix.stackexchange.com/questions/137275). Trademarks are property of their respective owners. Disclaimer: All information is provided “AS IS” without warranty of any kind. You are responsible for your own actions. Please contact me if anything is amiss at Roel D.OT VandePaar A.T gmail.com.