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+Inserts `element` in the list stored at `key` either before or after the
+reference value `pivot`.
+
+When `key` does not exist, it is considered an empty list and no operation is
+performed.
+
+An error is returned when `key` exists but does not hold a list value.
+
+@return
+
+@integer-reply: the length of the list after the insert operation, or `-1` when
+the value `pivot` was not found.
+
+@examples
+
+```cli
+RPUSH mylist "Hello"
+RPUSH mylist "World"
+LINSERT mylist BEFORE "World" "There"
+LRANGE mylist 0 -1
+```