Help needed! Error in setwd(newdir) : cannot change working directory

Hi Guys,

I am new to R and just trying to write a small script to automate a couple commands. But I run into the setwd(): cannot change working directory.
I googled a little bit and tried all fixes/suggestions with no success.
Basically I have a script that works from inside a directory with my data (/home/sean/Rtest/Data01). Now I want to modify the script to make it run from the upper directory (/home/sean/Rtest) because I have many data directories under /Rtest, such as /home/sean/Rtest/Data01, /home/sean/Rtest/Data02, /home/sean/Rtest/Data03,.....
I want to modify my script so that it will run from /Rtest, and with the data directory name as arg passed to my R script. Here is my mytest02.R script:

# retrieve args>>args <- commandArgs(TRUE);>># store the current directory>>initial.dir <- getwd();>>newdir <- paste(initial.dir,args,sep="/");>>outfilename <- paste(args,"out",sep=".");>># change to the new directory>>setwd(newdir);>># load the necessary libraries>>library("A"); ?#>>library("B");>>library("C");>># set the output file>>sink(outfilename);>>........ ? ?#data processing>>........ ? ?#data processing>>........ ? ?#data processing>># close the output file>>sink();>># unload the libraries>>detach("package:A"); ?#>>detach("package:B");>>detach("package:C");>># change back to the original directory>>setwd(initial.dir);

Then I run the script by

sean at I7-3930K:~/Rtest$ R --slave --args Data01 < mytest02.R

I got the error message:

sean at I7-3930K:~/Rtest$ R --slave --args Data01 < mytest02.R>>Attempting to load the environment ?package:R.utils?>>Loading required package: R.methodsS3>>R.methodsS3 v1.2.1 (2010-09-18) successfully loaded. See ?R.methodsS3 for help.>>Loading required package: utils>>R.oo v1.8.3 (2011-11-01) successfully loaded. See ?R.oo for help.>>>>Attaching package: ?R.oo?>>>>The following object(s) are masked from ?package:R.methodsS3?:>> >> ? throw.default>>>>The following object(s) are masked from ?package:methods?:>> >> ? getClass, getClasses, getMethods>>>>The following object(s) are masked from ?package:base?:>> >> ? attach, detach, environment, gc, load, save>>>>R.utils v1.9.11 (2012-01-17) successfully loaded. See ?R.utils for help.>>>>Attaching package: ?R.utils?>>>>The following object(s) are masked from ?package:utils?:>>>> ? ?timestamp>>>>The following object(s) are masked from ?package:base?:>>>> ? ?cat, commandArgs, getOption, inherits, isOpen, lapply, parse,>> ? ?remove, warnings>>>>[1] "/home/sean/Rtest">>[1] "/home/sean/Rtest/NA" ? ? ? "/home/sean/Rtest/TRUE" ? ?>>[3] "/home/sean/Rtest/Data01">>[1] "NA.out" ? ? ? "TRUE.out" ? ? "Data01.out">>Error in setwd(newdir) : cannot change working directory>>Execution halted

What did I do wrong?
One more question, is there anyway to modify this script to make it work on all data directories under /home/sean/Rtest by itself?
Thanks a lot for the help!
Ying

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