flush — flushes output to a terminal (Linux).
(flush)
none
A message indicating success or error. Please refer to Return Syntax for details.
This command is not used at all in Windows, and even in Linux and QNX there is really not much need for it. The command sends a flush to the terminal, so that if the DataHub instance is printing to a terminal and has not completely flushed its output, this will cause all pending printed characters to appear.