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https://serverfault.com/questions/340837/how-to-delete-all-but-last-n-zfs-snapshots#340846 | |
You may find something like this a little simpler | |
zfs list -t snapshot -o name | grep ^tank@Auto | tac | tail -n +16 | xargs -n 1 zfs destroy -r | |
output the list of snapshot (names only) with zfs list -t snaphot -o name | |
filter to keep only the ones that match tank@Auto with grep ^tank@Auto | |
reverse the list (previously sorted from oldest to newest) with tac | |
limit output to the 16th oldest result and following with tail -n +16 |