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+Instruct Redis to start an [Append Only File][tpaof] rewrite process. The
+rewrite will create a small optimized version of the current Append Only File.
+
+[tpaof]: /topics/persistence#append-only-file
+
+If `BGREWRITEAOF` fails, no data gets lost as the old AOF will be untouched.
+
+The rewrite will be only triggered by Redis if there is not already a background
+process doing persistence.
+
+Specifically:
+
+- If a Redis child is creating a snapshot on disk, the AOF rewrite is
+  _scheduled_ but not started until the saving child producing the RDB file
+  terminates. In this case the `BGREWRITEAOF` will still return an positive
+  status reply, but with an appropriate message. You can check if an AOF rewrite
+  is scheduled looking at the `INFO` command as of Redis 2.6 or successive
+  versions.
+- If an AOF rewrite is already in progress the command returns an error and no
+  AOF rewrite will be scheduled for a later time.
+- If the AOF rewrite could start, but the attempt at starting it fails (for
+  instance because of an error in creating the child process), an error is
+  returned to the caller.
+
+Since Redis 2.4 the AOF rewrite is automatically triggered by Redis, however the
+`BGREWRITEAOF` command can be used to trigger a rewrite at any time.
+
+Please refer to the [persistence documentation][tp] for detailed information.
+
+[tp]: /topics/persistence
+
+@return
+
+@simple-string-reply: A simple string reply indicating that the rewriting
+started or is about to start ASAP, when the call is executed with success.
+
+The command may reply with an error in certain cases, as documented above.