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PO
 

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    <p>Both of these operations restore a set of files to a previous state and are essentially faster, safer ways of undoing mistakes than using the <code>p4 obliterate</code> command (and you don't need admin access to use them). </p> <p>In the case of "Rollback...", this could be any number of files, even an entire depot. You can tell it to rollback to a specific revision, changelist, or label. The files are restored to the state they were in at the time of creation of that revision, changelist, or label.</p> <p>In the case of "Back Out Submitted Changelist #####", the restore operation is restricted to the files that were submitted in changelist #####. Those files are restored to the state they were in before you submitted that changelist, provided no changes have been made to those files since. If subsequent changes have been made to any of those files, Perforce will tell you that those files are now out of date. You will have to sync to the head revision and then resolve the differences. This way you don't inadvertently clobber any changes that you actually want to keep.</p> <p>Both operations work by essentially submitting old revisions as new revisions. When you perform a "Rollback...", you are <em>restoring the files to the state they were in at a specific point in time</em>, regardless of what has happened to them since. When you perform a "Back out...", you are attempting to <em>undo the changes you made at a specific point in time</em>, while maintaining the changes that have occurred since.</p>
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    1. POWhat is the difference between "Rollback..." and "Back Out Submitted Changelist #####" in Perforce P4V
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    1. COI **think** "Back Out Submitted Changelist #####" will **try** to keep changes that were made to the same files after the given change list.
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      1. USIan Ringrose
    2. CO@Ian: Good observation. When I wrote this I was thinking along the lines of _immediately_ correcting a mistake. As is usually the case, should you realize you want to undo something _much later_, it gets more complicated. I refined my answer.
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    3. CO@IanRingrose I just did a "backout" operation, and it looks like it *doesn't* attempt to keep the changes that were made afterwards. I had to do a sync and then resolve in order to get the changes back in which were submitted after the backout.
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