bash中，Linux的：两个文本文件之间的差异设置 [英] bash, Linux: Set difference between two text files

问题描述

我有两个文件 A - nodes_to_delete 和 B - nodes_to_keep 。每个文件都有一个多线，数字ID。

I have two files A-nodes_to_delete and B-nodes_to_keep. Each file has a many lines with numeric ids.

我想有数字ID是在 nodes_to_delete ，但不是在 nodes_to_keep ，例如列表。

I want to have the list of numeric ids that are in nodes_to_delete but NOT in nodes_to_keep, e.g. .

在PostgreSQL数据库中这样做是不合理的缓慢。任何整洁的方式使用Linux CLI工具做在bash？

Doing it within a PostgreSQL database is unreasonably slow. Any neat way to do it in bash using Linux CLI tools?

更新：这似乎是一个Python化的工作，但这些文件是真的，真的很大。我已经解决了使用 uniq的，排序一些集理论技术的一些类似的问题和。这大约是两个或三个数量级比数据库当量更快

UPDATE: This would seem to be a Pythonic job, but the files are really, really large. I have solved some similar problems using uniq, sort and some set theory techniques. This was about two or three orders of magnitude faster than the database equivalents.

推荐答案

借助 COMM 命令这样做的。

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