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Before we continue, you should know a bit about how to identify a particular revision in your repository. As you learned in Section 2.3.2, a revision is a snapshot of the repository at a particular moment in time. As you continue to commit and grow your repository, you need a mechanism for identifying these snapshots.
You specify these revisions by using the --revision (-r) switch plus the revision you want (svn —revision REV), or you can specify a range by separating two revisions with a colon (svn —revision REV1:REV2). Subversion lets you refer to these revisions by number, keyword, or date.