You can delete a range of ZFS snapshots (a-z) in multiple ways.

The following will delete d and all earlier snapshots:

zfs destroy mypool/data@%d

To delete d and all later snapshots:

zfs destroy mypool/data@d%

To delete all dataset snapshots:

zfs destroy mypool/data@%

Make sure to let ZFS perform a dry run (-n option) first and display (-v) what

it would do to confirm that the delete operation is removing exactly what you

intended.

-- Benedict Reuschling