Samba dfree ZFS and Non-ZFS

#!/bin/bash

    CUR_PATH=`pwd`
    ZFS_CHECK_OUTPUT=$(zfs get type $CUR_PATH 2>&1 > /dev/null) > /dev/null
    if [[ $ZFS_CHECK_OUTPUT == *not\ a\ ZFS* ]]
    then
        IS_ZFS=false
    else
        IS_ZFS=true
    fi
   if [[ $IS_ZFS = false ]]
   then
   df $CUR_PATH | tail -1 | awk '{print $2" "$4}'
   else
    USED=$((`zfs get -o value -Hp used $CUR_PATH` / 1024)) > /dev/null
    AVAIL=$((`zfs get -o value -Hp available $CUR_PATH` / 1024)) > /dev/null

    TOTAL=$(($USED+$AVAIL)) > /dev/null

    echo $TOTAL $AVAIL
    fi