使用带有符号链接文件的 read.csv [英] Using read.csv with a symlinked file

问题描述

我想做什么

我的源文件非常大，我想避免将其复制到其他文件夹中.我决定创建一个指向大文件的符号链接，并希望使用 read.csv 读取文件.

My source file is very large and I want to avoid copying it into other folders. I decided to create a symlink to the large file and want to use read.csv to read in the file.

文件夹结构

• project1/data/source-file.csv
• project2/data/alias-to-source-file.csv

出了什么问题

在源文件中读取工作正常，但是当我尝试在符号链接中读取时，出现以下错误:第 1 行似乎包含嵌入的空值.

Reading in the source file works perfectly, but when I try to read in the symlink, I get the following error: line 1 appears to contain embedded nulls.

我知道我可以复制文件并将其放入我的第二个项目的文件夹中，但我想知道是否有使用符号链接的方法.如果没有，我想知道一种避免跨多个项目复制数据文件的好方法.

I know that I can just duplicate the file and put it into my second project's folder, but I want to know if there is a way to use symlinks. If not, I would like to know of a good way to avoid duplicating data files across many projects.

推荐答案

符号链接在我的系统上正确制作时有效.

Symlinks work when made correctly on my system.

> read.csv("foo.csv")
  X1 X2 X3
1  3  4  5
2  5  6  7
> system("ln -s foo.csv bar.csv")
> read.csv("bar.csv")
  X1 X2 X3
1  3  4  5
2  5  6  7

错误的符号链接会产生错误，但我无法复制您的错误:

Bad symlinks can produce errors, but I can't replicate your error:

指向不存在文件的符号链接:

Symlink to non-existent file:

> system("ln -s nonsuch.csv baz.csv")
> read.csv("baz.csv")
Error in file(file, "rt") : cannot open the connection
In addition: Warning message:
In file(file, "rt") : cannot open file 'baz.csv': No such file or directory

链接到现有目录文件夹:

Link to existent directory folder:

> system("ln -s / qux.csv")
> read.csv("qux.csv")
Error in read.table(file = file, header = header, sep = sep, quote = quote,  : 
  no lines available in input

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