为什么（或者）为RSCRIPT（或利特勒）除R CMD批好？ [英] Why (or when) is Rscript (or littler) better than R CMD BATCH?

问题描述

我自动化一些webscraping与研究在的cron 有时我用研究CMD批有时我用 RSCRIPT 。

I am automating some webscraping with R in cron and sometimes I use R CMD BATCH and sometimes I use Rscript.

要决定使用哪一个我主要关注，如果我想在 .Rout 文件或没有。

To decide which one to use I mainly focus if I want the .Rout file or not.

但阅读的答案在这里的一些问题在SO（如这或<一个href=\"http://stackoverflow.com/questions/14167178/passing-command-line-arguments-to-r-cmd-batch\">this)似乎 RSCRIPT 是preferred到研究CMD批。

But reading the answers to some questions here in SO (like this or this) it seems that Rscript is preferred to R CMD BATCH.

所以我的问题是：

• 除了这个事实，语法是有点不同的，研究CMD批节省了 .Rout 文件，而 RSCRIPT 不，什么是他们两个？

• Besides the fact that the syntax is a little different and R CMD BATCH saves an .Rout file while Rscript does not, what are the main differences between the two of them?

当我应该preFER一个比另一个？更具体地说，在上面提到的的cron 的工作，就是其中之一preferred？

When should I prefer one over another? More specifically, in the cron job above mentioned, is one of them preferred?

我没有使用尚未利特勒，它是如何从两个不同的 RSCRIPT 和研究CMD批？

I have not used yet littler, how is it different from both Rscript and R CMD BATCH?

推荐答案

研究CMD批就是我们几年前了。它使I / O非常辛苦和叶隐藏文件。

R CMD BATCH is all we had years ago. It makes i/o very hard and leaves files behind.

事情RSCRIPT好转，先用利特勒，然后过。既可以用于'认领'线，如

Things got better, first with littler and then too with Rscript. Both can be used for 'shebang' lines such as

 #!/usr/bin/r

 #!/usr/bin/Rscript

和两者都可以用类似的getopt和optparse包使​​用---允许你编写正确的 - [R脚本，可以为命令行事。如果有几十人，从简单的像这样，我可以为调用install.r pkga则pkgB pkgc ，而且还会从安装所有三个和他们的依赖）对我来说命令行不占用第r提示：

and both can be used with packages like getopt and optparse --- allowing you to write proper R scripts that can act as commands. If have dozens of them, starting with simple ones like this which I can call as install.r pkga pkgb pkgc and which will install all three and their dependencies) for me from the command-line without hogging the R prompt:

#!/usr/bin/env r       
#
# a simple example to install one or more packages 

if (is.null(argv) | length(argv)<1) {
  cat("Usage: installr.r pkg1 [pkg2 pkg3 ...]\n")
  q()
}

## adjust as necessary, see help('download.packages') 
repos <- "http://cran.rstudio.com"

## this makes sense on Debian where no packages touch /usr/local 
lib.loc <- "/usr/local/lib/R/site-library"

install.packages(argv, lib.loc, repos)

和就像卡尔，我有cronjobs调用类似 - [R脚本。

And just like Karl, I have cronjobs calling similar R scripts.

的在2015年11月4日编辑：的截至上周，的现在利特勒也是在CRAN 。

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