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This patch moves some code out of the "write" handler, with the intention
to reuse it later for similar commands.

At the same time, it also discards the previous transfer rate output when
using "-v", as that has become redundant with the 'progress bar' display
available by "-p".
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>