R help - Jan 2015 - Avoid R shell process echoes of piped inputs from a different programming language on Linux

Dear R developers,
?
i have rather a developer question.
?
>From an external application (different programming language)? i contact R
through pipes (process pipes -> exec....).
?
On Linux i use the R (bash) script to start the R process which will be
available in a custom shell.
?
If i pipe a command to R i have the problem that the command is echoed in my
shell connection which i would like to avoid.
?
A R command is written in the output stream and the problem is that it is
rewritten again in the input stream (which is output of the shell).
?
If i start the bash shell independant from the R process i got the same results
if i pipe commands to the output.
?
If i start a Bourne-Shell independant from the R process the command is not
echoed in the input stream.
?
So maybe it is possible that R can be started without echoing the commands of
the output stream of the process under the Linux envrironment?
?
On Windows for example echoing (with Rterm) is not a problem.
?
Thanks in advance for any suggestion or help.

I don't know the answer to your question.  If nobody else answers it,
I'd suggest asking in R-devel instead, and include some simple code that
illustrates the problem, e.g. using "echo" to pipe something into an R
process and explaining what part of the output you want to suppress.

Duncan Murdoch

On 14/01/2015 3:39 AM, marcel Austenfeld wrote:
> 
> Dear R developers,
>  
> i have rather a developer question.
>  
>>From an external application (different programming language)  i contact
R through pipes (process pipes -> exec....).
>  
> On Linux i use the R (bash) script to start the R process which will be
available in a custom shell.
>  
> If i pipe a command to R i have the problem that the command is echoed in
my shell connection which i would like to avoid.
>  
> A R command is written in the output stream and the problem is that it is
rewritten again in the input stream (which is output of the shell).
>  
> If i start the bash shell independant from the R process i got the same
results if i pipe commands to the output.
>  
> If i start a Bourne-Shell independant from the R process the command is not
echoed in the input stream.
>  
> So maybe it is possible that R can be started without echoing the commands
of the output stream of the process under the Linux envrironment?
>  
> On Windows for example echoing (with Rterm) is not a problem.
>  
> Thanks in advance for any suggestion or help.
> 
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