Get used user quotas from btrfs volume

usedUserSpace.sh

#!/bin/bash

userList=$(cat /etc/passwd)
volume=/volume1/
usedSpaceList=""

IFS=$'\n'
for user in $userList
do
	userName=$(echo $user | cut -d : -f 1)
	userId=$(echo $user | cut -d : -f 3)
	usedSpace=$(btrfs usrquota show -an -u $userId $volume | cut -d " " -f 3 | awk '{s+=$1} END {printf "%.0f", s}')
	usedSpaceHumanReadable=$(echo $usedSpace | numfmt --to=iec)
	usedSpaceList=$(echo -e "$usedSpaceList\n$usedSpace\t$usedSpaceHumanReadable\t$userName")
done

echo "$usedSpaceList" | sort -n