[R] how to run a R program with input arguments

[edisonying]

Thanks for your help. I found another cmd as follows:

   R CMD BATCH  infile  outfile

what's the difference between this expression and your suggestion?

cls59 wrote:
> 
> 
> edisonying wrote:
>> 
>> I am a beginner in R and know only a little about it yet. I have a script
>> written in R language, named as "a.txt" for example. I am using a Linux
>> machine, at present I only know that I can type "R" in the terminal and
>> then copy-paste the content in "a.txt" to the R's interface to execute
>> the program. However, I want to know if there is any method that allows
>> me to add some input arguments directly after the "R" in the terminal.
>> Specifically, I want to type the following in the cmd line:
>> 
>>    R (some flags or option) a.txt
>> 
>> then the program will begin to run. Besides, if the program will read a
>> data file first, can I also specify the data file in the command line?
>> Then the complete command will become:
>> 
>>    R  a.txt  data.txt
>> 
>> This is important for a beginner. Thanks very much!:working:
>>    
>> 
> 
> We usually have R execute scripts in the following manner:
> 
> R --vanilla --slave --args [your args here] < scriptFile.R
> 
> Inside scriptFile.R the arguments can be retrieved by using
> commandArgs(trailingOnly = T). The trailingOnly flag causes only the
> arguments following --args to be be returned and not --args, --vanilla (no
> save, no restore, quick startup) and --slave (makes R run quiet). 
> 
> Personally, I get tired of typing R --vanilla --slave --args all the time
> and prefer to use Rscript. Since you are using Linux you can do the same
> by putting the following hashbang at the top of your file:
> 
> #!/usr/bin/env Rscript
> 
> Then your script can be run using:
> 
> ./scriptFile.R [your args here]
> 
> The arguments are still accessed inside the script using commandArgs(T)
> 
> Good luck!
> 
> -Charlie
> 
> 

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