[Borgbackup] extended prune

[Thomas Waldmann]

> oh my, this sounds great! Do I understand correctly that this
> kind of deletion has the same I/O benefits as prune would have?

No, in the code it is just deleting / committing each given archive
individually.

So you just save entering multiple borg commands.

> And about the invocation syntax, does the following example
> look correct to you? So for multi-deletion, there is no double
> colon between repo and archive, correct?
>
> #> borg delete /path/to/repo hostA-2018051646 hostB-2018040250

Yes.

But the code would even understand both:

# borg delete repo  archive1 archive2 archive3
# borg delete repo::archive1 archive2 archive3



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