for snap in `zfs list -t snapshot 2>/dev/null | grep "^$zfs_pool" | grep "$snap_pattern" | awk '{print $1}'`; do
echo " destroying snapshot: $snap"
for snap in `zfs list -t snapshot 2>/dev/null | grep "^$zfs_pool" | grep "$snap_pattern" | awk '{print $1}'`; do
echo " destroying snapshot: $snap"