Run R script from command line on Ubuntu


Outline
  1. 1. Install R on Ubuntu
  2. 2. Run R script from command line
    1. 2.1. 方法一：use Rscipt
    2. 2.2. 方法二：第一行加入 #!/usr/bin/Rscript 如下範例程式：
    3. 2.3. If you get ^M Problem
  3. 3. Read Command line Argument
  4. 4. Reference

目的：希望能透過 cmd 的方式執行 ./script.r 的檔案，並且讀進 Arguments。

Install R on Ubuntu

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$ sudo apt-get update
$ sudo apt-get install r-base
# installing packages
$ sudo apt-get install r-base-dev

Run R script from command line

方法一：use Rscipt

方法二：第一行加入 #!/usr/bin/Rscript 如下範例程式：

  • Sample code test.r:
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#!/usr/bin/Rscript
print("HelloR")
  • Reminding: You can use $ which Rscript to search your path to Rscript.
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$ which Rscript
/usr/bin/Rscript
  • Run sample code test.r from command line:
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# 方法一執行方式
$ Rscipt test.r
# 方法二執行方式
$ ./test.r

If you get ^M Problem

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$ ./test.r   
zsh: ./test.r: bad interpreter: /usr/bin/Rscript^M: 沒有此一檔案或目錄

This is an encoding problem at the end of line, your can use Line endings setting of Sublime: View > Line Endings > Unix

▲ Figure: Line endings setting of Sublime

Read Command line Argument

  • Sample code test.r:
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#!/usr/bin/Rscript
args<-commandArgs(TRUE)
print(args[1])
  • Run sample code test.r from command line:
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$ ./test.r 1 2 3 4 
[1] "1"
  • Reminding: Arguments list start from index 1.

Reference

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