#!/bin/bash
# zfs_scrub start <pool>
# zfs_scrub clear <pool>
# zfs_scrub status <pool>
# zfs_scrub cancel <pool> 

case "$1" in
'start')
  exec /usr/sbin/zpool scrub $2 2>/dev/null
;;
'clear')
  exec /usr/sbin/zpool clear $2 2>/dev/null
;;
'status')
  # first output whatever the status is to stdout
  /usr/sbin/zpool status -P $2
  # establish retval of this script: 0 running, 1 not running
  /usr/sbin/zpool status -P $2 | grep -q 'scrub in progress'
;;
'cancel')
  /usr/sbin/zpool scrub -s $2 2>/dev/null
;;
esac