R help - Apr 2011 - output usage info to stdout

Hi all,


                I want to run a R code in the batch mode under UNIX system.
Inside that code, I have a usage() function to give the hints regarding
parameters. For example
usage = function()
{
    msg = "R CMD BATCH --save \"--args
path=\\\"input_path\\\" file=\\\"input_file\\\"
[seed=\\\"integer\\\" proportion=\\\"[0-1]\\\"
outpath=\\\"output_path\\\"
outfile=\\\"output_file\\\"]\"
/S/hxd/utils/sampleRecords.r.txt";
   print(msg);
}

                When I run the code like

R CMD BATCH mycode.R, I want to output the usage info if the required parameters
are not there. But how to output the usage info listed above to standard out
rather than to a file?


Thanks.

HXD


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