[Rd] Out buffers flushing

[Roman Savchenko]

Hey Dear R devs,

I'm using R CMD BATCH output stream as control stream (via IPC) in my
project. I noticed that sometimes I'm not receiving out line intime (that
leads to unwanted behaviour). I suspect it is due to some buffering
mechanism. I tried to use flush.console() but it does not help.

Thanks for any advices,
Roman.

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