如何计算在linux上的两个文件之间的差异？ [英] How to count differences between two files on linux?

问题描述

我需要处理大文件，必须找到两者之间的差异。 < / p>

为了找到不同行的数量，我想出了

  diff --suppress-common-lines --speed-large-files -y File1 File2 | wc -l 
  

它可以工作，但是有更好的方法吗？

如何计算差异的确切数量（使用标准工具，如bash，diff，awk，sed一些旧版本的perl）？

解决方案

  diff -U 0 file1 file2 | grep -v ^ @ | wc -l 
  

diff 列表。统一格式可能比并列格式快一点。

I need to work with large files and must find differences between two. And I don't need the different bits, but the number of differences.

To find the number of different rows I come up with

diff --suppress-common-lines --speed-large-files -y File1 File2 | wc -l

And it works, but is there a better way to do it?

And how to count the exact number of differences (with standard tools like bash, diff, awk, sed some old version of perl)?

解决方案

diff -U 0 file1 file2 | grep -v ^@ | wc -l

That minus 2 for the two file names at the top of the diff listing. Unified format is probably a bit faster than side-by-side format.

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