[R] command option for R CMD BATCH

[Patrick Connolly]

I wish to use R CMD BATCH to run a small R function which reads a text
file and plots a single graph to a PDF file.

> version
               _                           
platform       x86_64-unknown-linux-gnu    
arch           x86_64                      
os             linux-gnu                   
system         x86_64, linux-gnu           
status                                     
major          2                           
minor          4.0                         
year           2006                        
month          10                          
day            03                          
svn rev        39566                       
language       R                           
version.string R version 2.4.0 (2006-10-03)
> 

The text files are monthly data, (called lyrical names like
October.txt or November.txt) and the end result of each run will be a
PDF file called October.pdf, etc.

It's simple enough to make a separate file for each month which has
the command to call the R function, e.g.  October.r would be
plot.month("October.txt")
 and use it like so:

R CMD BATCH October.r /dev/null 
(the R function creates the name for the PDF file)

or slightly more elegantly, a one line shell script that takes an argument:
R CMD BATCH $1.r /dev/null
(so that the script name and the name of the month will make a PDF
file for that month)

What I'd like to do is avoid the need to make the Month.r files and
have the script pass the month information directly to the function
that a single .r file would call.  If I brushed up on a bit of Perl, I
might work out how to modify the shell script to do such a thing, but
I suspect it should be simpler than that.

I had thought of using litter for such a thing, but as I looked into
it, I get the impression that's not the idea of litter.  (I'm also a
bit reluctant to recompile R.)

Ideas welcome.


Thanks

-- 
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.   
   ___    Patrick Connolly   
 {~._.~}          		 Great minds discuss ideas    
 _( Y )_  	  	        Middle minds discuss events 
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