#!/bin/sh

TODAY=`date "+%y%m%d"`
ZROOT="zroot"
ZFS="/sbin/zfs "
# Seven day ago
# -------------

SEVEND=`date -j -v"-7d" +"%s"`

IFS=$'\n' 
for i in `zfs list -Hp -t snap -o name,creation -s creation`  
do
	# caution: tab is the separator
	SNAPCREATED=${i##*	}
	di=`expr ${SNAPCREATED} - ${SEVEND}`
	[ ${SNAPCREATED} -lt ${SEVEND} ] && echo "${i%%	*} is more than 7 days old"
done