How to loop over files in natural order in Bash?

by 
readarray -d '' entries < <(printf '%s\0' *.fas | sort -zV)
for entry in "${entries[@]}"; do
  # do something with $entry
done

where printf '%s\0' *.fas yields a NUL separated list of directory entries with the extension .fas, and sort -zV sorts them in natural order.

Note that you need GNU sort installed in order for this to work.

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