在文件中查找唯一字符 [英] Find Unique Characters in a File

问题描述

我有一个包含450,000多个条目行的文件.每个条目的长度约为7个字符.我想知道的是此文件的唯一字符.

I have a file with 450,000+ rows of entries. Each entry is about 7 characters in length. What I want to know is the unique characters of this file.

例如，如果我的文件是以下文件；

For instance, if my file were the following;

Entry
-----
Yabba
Dabba
Doo

那么结果将是

唯一字符:{abdoy}

Unique characters: {abdoy}

注意，我不在乎大小写，也不需要订购结果.有件事告诉我，这对于Linux人员来说很容易解决.

Notice I don't care about case and don't need to order the results. Something tells me this is very easy for the Linux folks to solve.

我正在寻找一种非常快速的解决方案.我真的不想创建代码来遍历每个条目，遍历每个字符...等等.我正在寻找一个不错的脚本解决方案.

I'm looking for a very fast solution. I really don't want to have to create code to loop over each entry, loop through each character...and so on. I'm looking for a nice script solution.

通过快速，我的意思是快速实施...不一定快速运行.

By Fast, I mean fast to implement...not necessarily fast to run.

推荐答案

下面是一个 PowerShell 示例:

gc file.txt | select -Skip 2 | % { $_.ToCharArray() } | sort -CaseSensitive -Unique

产生:

D
Y
一个
b
o

D
Y
a
b
o

我喜欢它很容易阅读.

编辑:这是一个更快的版本:

EDIT: Here's a faster version:

$letters = @{} ; gc file.txt | select -Skip 2 | % { $_.ToCharArray() } | % { $letters[$_] = $true } ; $letters.Keys

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