Powershell/Perl:将多个 CSV 文件合并为一个? [英] Powershell / Perl : Merging multiple CSV files into one?

问题描述

我有以下 CSV 文件，我想将它们合并为一个 CSV

I have the following CSV files, I want to merge these into a single CSV

01.csv

apples,48,12,7
pear,17,16,2
orange,22,6,1

02.csv

apples,51,8,6
grape,87,42,12
pear,22,3,7

03.csv

apples,11,12,13
grape,81,5,8
pear,11,5,6

04.csv

apples,14,12,8
orange,5,7,9

所需的输出:

apples,48,12,7,51,8,6,11,12,13,14,12,8
grape,,,87,42,12,81,5,8,,,
pear,17,16,2,22,3,7,11,5,6,,,
orange,22,6,1,,,,,,5,7,9

谁能提供有关如何实现这一目标的指导?最好使用 Powershell，但如果更容易，也可以使用 Perl 等替代品.

Can anyone provide guidance on how to achieve this? Preferably using Powershell but open to alternatives like Perl if that's easier.

谢谢 Pantik，您的代码输出接近我想要的:

Thanks Pantik, your code's output is close to what I want:

apples,48,12,7,51,8,6,11,12,13,14,12,8
grape,87,42,12,81,5,8
orange,22,6,1,5,7,9
pear,17,16,2,22,3,7,11,5,6

不幸的是，当条目不存在于 CSV 文件中时，我需要占位符"逗号，例如橙色,22,6,1,,,,,,5,7,9 而不是橙色,22,6,1,5,7,9

Unfortunately I need "placeholder" commas in place for when the entry is NOT present in a CSV file, e.g. orange,22,6,1,,,,,,5,7,9 rather than orange,22,6,1,5,7,9

更新:我希望按照文件名的顺序解析这些文件，例如:

UPDATE: I would like these parsed in order of the filenames, e.g.:

$myFiles = @(gci *.csv) | sort Name
foreach ($file in $myFiles){

问候

推荐答案

这是我的 Perl 版本:

Here is my Perl version:

use strict;
use warnings;

my $filenum = 0;

my ( %fruits, %data );
foreach my $file ( sort glob("*.csv") ) {

    $filenum++;
    open my $fh, "<", $file or die $!;

    while ( my $line = <$fh> ) {

        chomp $line;

        my ( $fruit, @values ) = split /,/, $line;

        $fruits{$fruit} = 1;

        $data{$filenum}{$fruit} = \@values;
    }

    close $fh;
}
foreach my $fruit ( sort keys %fruits ) {

    print $fruit, ",", join( ",", map { $data{$_}{$fruit} ? @{ $data{$_}{$fruit} } : ",," } 1 .. $filenum ), "\n";
}

这给了我:

apples,48,12,7,51,8,6,11,12,13,14,12,8
grape,,,,87,42,12,81,5,8,,,
orange,22,6,1,,,,,,,5,7,9
pear,17,16,2,22,3,7,11,5,6,,,

那么你对葡萄有一个错别字还是我误会了什么?

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