Preview flag

The #preview flag lets you see what the result of a rollback or restore would be, without actually applying it.

It's incredibly useful for if you're not sure which command to use and so you don't want to fully apply a rollback/restore.

Example: rolling back griefing

If you want to roll back griefing on user Minecraft123's house but aren't sure exactly which command to use, you can test out the results of a rollback like this:

/co rollback radius:30 exclude:Minecraft123 time:7d #preview

That way, you can check the rollback will actually do what you want it to do, so you won't accidentally break something that can't fully be reverted using /co undo.

Example: restoring an incorrect rollback

Let's say you didn't learn your lesson above and rolled back the house without previewing first. You accidentally deleted the house above because you forgot the exclude:Minecraft123. You'd restore it like this:

/co restore radius:30 time:7d user:Minecraft123

... in order to restore any actions done by Minecraft123.

But you could make sure that this would restore the house by adding the #preview flag:

/co restore radius:30 time:7d user:Minecraft123 #preview

A note about rollbacks

If you add the #preview flag, coreprotect won't actually roll anything back.
You'll need to rerun the rollback command without the #preview if you want to complete a rollback.