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Clean up old zfs snapshots
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
then destroy with xargs -n 1 zfs destroy -vr
deleting snapshots in reverse order is supposedly more efficient.
or sort in reverse order of creation
zfs list -t snapshot -o name -S creation | grep ^tank@Auto | tail -n +16 | xargs -n 1 zfs destroy -vr
Test it with ...|xargs -n 1 echo
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