加入多个文件

问题描述

我使用标准连接命令连接基于 column1 的两个排序文件.命令是简单的 join file1 file2 > output_file.

I am using the standard join command to join two sorted files based on column1.The command is simple join file1 file2 > output_file.

但是我如何使用相同的技术连接 3 个或更多文件?加入 file1 file2 file3 > output_file上面的命令给了我一个空文件.我认为 sed 可以帮助我，但我不太确定如何?

But how do I join 3 or more files using the same technique ?join file1 file2 file3 > output_fileAbove command gave me an empty file.I think sed can help me but I am not too sure how ?

推荐答案

man join:

NAME
       join - join lines of two files on a common field

SYNOPSIS
       join [OPTION]... FILE1 FILE2

它仅适用于两个文件.

如果你需要加入三个，也许你可以先加入前两个，然后加入第三个.

if you need to join three, maybe you can first join the first two, then join the third.

试试:

join file1 file2 | join - file3 > output

应该在不创建中间临时文件的情况下加入三个文件.- 告诉 join 命令从 stdin

that should join the three files without creating an intermediate temp file. - tells the join command to read the first input stream from stdin

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