[R] Execute script and go interactive

[Prof Brian Ripley]

On Fri, 27 Feb 2009, Michael Olschimke wrote:

> Hi,
>
> is it possible to execute a script with R and go into interactive mode
> with the same session?

Yes, the mechanism is 'read the script file specified by 
R_PROFILE_USER (or its defaults) and then continue interactively'.

See ?Startup.

> e.g.
>
> R < myscript.R
>> objects()
>
> Creating a .Rprofile is not an option for me.

You need to explain why you are rejecting the mechanism provided to 
do this, and precisely what your constraints are.  Note that the 
locations of both R_PROFILE_USER and R_PROFILE_SITE are set by 
environment variables, so it would be very unusual not to be able to 
make use of them.

An R session is either interactive or it is not, and that is decided 
early in the startup process.  A session started by redirecting input 
is not (unless overridden by command-line flags), and it will never 
read normal input from anywhere other than stdin.  There is no 
equivalent of sink() for input.

>
> Thank you
>
> Michael
>
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>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595