As is, this program (script) will not work under MacOS with the built-in bash shell as it does not include mapfile. Here is a workaround that DOES work... replace each of the three occurrences of mapfile with this equivalent code: ``` #mapfile -t screensavers < <(peak_into_the_gallery) screensavers=() while IFS= read -r line; do screensavers+=("$line") done < <(peak_into_the_gallery) ``` These changes work on my up-to-date MacOS install.