Get indexing status of all volumes known to mdutil

mdvolumes.sh

#!/usr/bin/env bash

vols=()
maxwidth=0
while read -r vol; do
    vols+=( "$vol" )
    maxwidth=$(echo -e "${maxwidth}\n${#vol}" | sort -n | tail -n1)
done < <(mdutil -a 2>&1 | awk -F: '{print $1}')

fmt="%-${maxwidth}s  %s\n"
for vol in "${vols[@]}"; do
    # yuck, BSD sed sucks :(
    # see: https://stackoverflow.com/questions/4438306/how-to-remove-trailing-whitespaces-with-sed/4438318#15416836
    status=$(mdutil -s "$vol" | tail -n +2 | sed -E 's/(^[[:space:]]*|[[:space:]]*$)//g')
    printf "$fmt" "$vol" "$status"
done

Rationale and example: