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What is a 'rollback' on the Stack Exchange sites? I see this mentioned as being necessary to earn the cleanup badge, but I do not understand the term.

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4 Answers 4

up vote 102 down vote accepted

A rollback does a couple of things:

  1. Most importantly, a rollback reverts a question (or answer) back to a previous version in the edit history. The rollback action itself then appears as the most recent item in the edit history.
  2. A rollback clears any offensive flags that have been set on a question.

Here's an example of what an edit history with a number of rollbacks looks like:

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All offensive tags, or just ones set during the current revision? Either way, I see potential to circumvent the offensive mechanism. –  Kyle Cronin Oct 29 '08 at 14:09
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All offensive flags. But that doesn't happen if you rollback your own question. It happens on a rollback by a user with high enough rep to edit other people's posts. –  Mark Biek Oct 29 '08 at 14:11
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"Notice that each revision that's not a rollback has a rollback link next to it." How come rev 11 and 14 are rollbacks but do have a rollback link, while 13 is not a rollback and does not have a rollback link? Sorry but I'm confused. –  Fabrício Matté Jul 18 '13 at 17:35
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I have edited your question. There is now a "rollback" option which you can press to revert the changes I made back to the original. That is the meaning of the term "rollback" as it is used on Stack Overflow and sister sites.

If you want to leave a comment with the rollback, then click the date next to "edited" to show the revision history, and next use the "edit" link of a specific old revision instead. Then, when not changing anything but simply only typing a comment in the "Edit Summary", you're also rolling back when saving.

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+1 - Nice way to demostrate. –  EBGreen Aug 24 '09 at 18:49
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I am a master backroller. –  XMLbog Aug 24 '09 at 18:50
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GREAT!!! THANK YOU :D –  Andrei Rinea Aug 24 '09 at 18:50
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A "lolback" is when you edit a joke back into a post –  bobobobo Dec 18 '11 at 20:23
    
@iShru what are you doing? –  Shadow Wizard Oct 11 '12 at 12:16
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@ShaWizDowArd sorry i was testing the rollback –  iShru Oct 11 '12 at 12:17
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@iShru oh, OK. Please use the sandbox in the future though, it's more appropriate for testings all of sorts. –  Shadow Wizard Oct 11 '12 at 12:21
    
Thanks @ShaWizDowArd ,i was not aware of it :) –  iShru Oct 11 '12 at 12:28
    
Thanks for your answer. –  Mohsen Alikhani Nov 4 '12 at 19:02
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Once a post has been edited, it could be rolled back by anyone with edit permissions for that post to a previous revision. The rollback button appears on the edit page after an initial edit has been made. Note this excludes edits that do not cause a revision history (edits by the OP made very shortly after posting).

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Note that it looks like it's not enough to edit the post and just select an earlier revision in the dropdown at the top. That will effectively set the content back to what it was earlier, but it doesn't actually count as a rollback - it doesn't count towards the Cleanup badge, and it (presumably) doesn't clear any flags.

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