Regex 通过命令行将双引号添加到csv文件的第一行

我有这个csv文件，我注意到在导出过程中，它没有添加到起始报价中。事实上，在ubuntu中，如果我键入：

head -n 1 file.csv

我得到这个输出：

801","40116","Hazelnut MT -L","Thursday Promo","Large","","5.9000","","801","1.0000","","3.6500","2.2500",".0000","default","","","","","Chatime","02/06/2014","09125a9cfffd4143a00e73e3b62f15f2","CB01","",".0000","5.9000","6.9000",".0000",".0000",".0000",".0000",".0000",".0000","0","","0","0","0","","","","","","","","","Modern Milk Tea","","","0","","","1","0","","","","","","","","0","Hau Chan","","","","","","","","","","0","","","","","","","-1","","","","","","","","","","","","0","00000000420714AA","2014-06-02","1900-01-01","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","",""

---

是否有一些命令类型可以帮助我添加缺少的起始引号？

这应该适用于每个posix shell：

printf \" | cat - file.csv > repaired-file.csv

如果您对结果满意，可以覆盖原始内容

mv repaired-file.csv file.csv

由于您的文件是70GB大小，您可能希望避免创建第二个文件，但这比看起来更难。当然，也有类似于

sed

的inplace选项（

-i

）和

moreutils

中的

海绵

实用程序的功能，但它们并不像您预期的那样工作

sed-i

和

spoone

都使用临时文件或将整个文件保存在内存中（不再适用于70GB）。关于真实就地编辑的大量研究可以在中找到。结论：没有标准工具支持真正的就地编辑。但是下面的

perl

一行程序应该可以工作（已经适应了您的需要）

---

perl这应该适用于每个posix shell：

printf \" | cat - file.csv > repaired-file.csv

如果您对结果满意，可以覆盖原始内容

mv repaired-file.csv file.csv

由于您的文件是70GB大小，您可能希望避免创建第二个文件，但这比看起来更难。当然，也有类似于
sed
的inplace选项（
-i
）和
moreutils
中的
海绵
实用程序的功能，但它们并不像您预期的那样工作
sed-i
和
spoone
都使用临时文件或将整个文件保存在内存中（不再适用于70GB）。关于真实就地编辑的大量研究可以在中找到。结论：没有标准工具支持真正的就地编辑。但是下面的
perl
一行程序应该可以工作（已经适应了您的需要）

有perl，但您也可以在文本编辑器中打开该文件并手动添加引号。它是一个70gb的csv文件。我想我打不开。哦，好的。。。这改变了一切。只是想确定一下：报价单是只在第一行丢失了，还是在每一行都丢失了？就像oguz ismail一样，我假设它只在第一行中丢失，因为你只显示了那一行。@Socowi只在第一行。下一个是正确的引号。有，但你也可以在文本编辑器中打开文件并手动添加引号。这是一个70gb的csv文件。我想我打不开。哦，好的。。。这改变了一切。只是想确定一下：报价单是只在第一行丢失了，还是在每一行都丢失了？就像oguz ismail一样，我假设它只在第一行中丢失，因为你只显示了那一行。@Socowi只在第一行。接下来的是正确的引号。