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the “bash” utility has an switch to deal with shell patterns that do not resolve – what’s its name?

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https://en.wikipedia.org/wiki/Bash_(Unix_shell)

$ shopt -s nullglob

I am making use of that feature in this script:

https://github.com/JochenHayek/misc/blob/master/renaming_scanner_files/WhatsApp.rename.sh

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