zfs rollback --last[=N]

[ChristophSchmidpeter]

Describe the feature would like to see added to OpenZFS

I suggest the addition of following syntax (unless somebody suggests a better syntax):

zfs rollback --last[=N] <pool/dataset> and zfs rollback -l [N] <pool/dataset>

e.g. zfs rollback --last[=N] MyPool/MyDataset rollbacks to the last and zfs rollback --last=1 MyPool/MyDataset rollbacks to the penultimate snapshot

How will this feature improve OpenZFS?

I often want to rollback to the last snapshot of a dataset.

And I have to do something like:

$zfs list -t snap long/path/to/filesystem
[...]
zfs rollback long/path/to/filesystem@long_snapshot_name

zfs rollback long/path/to/filesystem@long_snapshot_name

which is quite tedious, especially if I am e.g. in zfsbootmenu where I don't have autocomplete and a mouse / way to copy to clipboard.

There should be a way to refer to the last / last-x snapshot directly, similarly like with e.g. git rebase -i HEAD~4

Additional context