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#!/bin/sh
DEVICE="/dev/md0"
TOTAL_DEVICES=$(mdadm -D "$DEVICE" | grep 'Total Devices' | cut -d':' -f 2 | tr -d ' ')
mdadm -D "$DEVICE" | tail -n "$TOTAL_DEVICES" | tr -s ' ' | cut -d' ' -f 6
# Example Output:
#
# active
# active
# active
# active
# active
#
# Da https://linux.die.net/man/8/mdadm pare che gli output sensati siano "missing", "failed", "spare" ed "active".