R help - Aug 2010 - R script doesn't load libraries when called from cron

I have R script that i need to run in cron. Either R libraries or some .so
libraries that they depend on don't get loaded correctly. Here is an
example. I have a file, call it tmp.R


tmp.R
========================R --slave --args $0 $* <<EOF

cmarg = commandArgs()[5]
library(R.utils)
b<-intToBin(cmarg)
print(paste( "argument is ", cmarg, sep=""))
print(paste(" binary representation of argument is ", b))
==========================================

It loads a library R.utils, uses function intToBin from it, prints binary
rep of the argument. When i run it from command line like 

./tmp.R 10
it runs fine. Here is the output:

Output:
=============================Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.2.0 (2010-03-13) successfully loaded. See ?R.methodsS3 for
help.
R.oo v1.7.3 (2010-06-04) successfully loaded. See ?R.oo for help.
R.utils v1.4.0 (2010-03-24) successfully loaded. See ?R.utils for help.
Warning message:
package 'R.oo' was built under R version 2.8.1 and help may not work
correctly 
[1] "command argument is 10"
[1] " binary representation of argument is  1010"
=======================================

Now, here is the problem. When i run it from cron I get error message
===================================================Error in loadNamespace(name)
: there is no package called 'R.utils'
Calls: sys.load.image ... tryCatch -> tryCatchList -> tryCatchOne ->
<Anonymous>
Execution halted
===================================================
seemingly it has problems with loading library, but i cannot figure out why.
I tried running it using Rscript program, R CMD BATCH, calling R directly
and i always run into the same problem when called from cron. 
I am running 64 bit R v10 on 64 Red Hat Lunix. 






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Actually, i think i figured it out. My bad, i am inexperienced with cron.
When it runs, it doesn't have the environment. Once i wrapped my R script
into shell script that sourced the .bashrc file, i was back in business.
Maybe there is more elegant solution, without additional shell script --
possibly someone will chime in. 
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