循环 tar.gz 中的文件 [英] Loop over files in tar.gz

问题描述

我有 files.tar.gz 里面有一堆 csv 文件，每个文件都有一个标题.我想遍历 csv 文件并一次处理一个.如果我只是 zcat |tar -xO 全部，然后我将无法识别每个文件的开头，因此无法识别其标题.

I have files.tar.gz with a bunch of csv files inside, each having a header. I want to loop over the csv files and process them one at a time. If I just zcat | tar -xO them all, then I won't be able to identify the start of each file, and thus its header.

如何一次一个地循环存档中的文件，并将它们分别通过管道传送到处理命令?

How can I loop over the files in the archive one at a time, and pipe them individually to a processing command?

推荐答案

GNU tar 实用程序可以使用

The GNU tar utility can extract individual file from an archive to stdout with

tar -O -x -z -f archive.tgz 文件

假设为每个文件运行 tar 并不会太慢，这里有一个循环可以解决您的问题.

Here is a loop that might solve your problem, assuming running tar for each file is not prohibitively slow.

tar tzf files.tar.gz | while IFS= read -r f ; do 
   echo ">>> Processing file $f"
   tar Oxzf files.tar.gz "$f" | head | cat -n ;
done

<代码>命令 |而 IFS= read -r line 是一个 BASH 模式.当文件名中有空格时，清除 IFS 变量是代码正常工作所必需的.

command | while IFS= read -r line is a BASH pattern. Clearing the IFS variable is necessary for the code to work correctly when there are spaces in the file names.

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