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+Returns `PONG` if no argument is provided, otherwise return a copy of the
+argument as a bulk.
+This command is often used to test if a connection is still alive, or to measure
+latency.
+
+If the client is subscribed to a channel or a pattern, it will instead return a
+multi-bulk with a "pong" in the first position and an empty bulk in the second
+position, unless an argument is provided in which case it returns a copy
+of the argument.
+
+@return
+
+@simple-string-reply, and specifically `PONG`, when no argument is provided.
+
+@bulk-string-reply the argument provided, when applicable.
+
+@examples
+
+```cli
+PING
+
+PING "hello world"
+```