判断两个文件在Unix/Linux中是否具有相同内容的最快方法? [英] Fastest way to tell if two files have the same contents in Unix/Linux?

问题描述

我有一个Shell脚本，在其中需要检查两个文件是否包含相同的数据.我对大量文件执行此操作，并且在我的脚本中，diff命令似乎是性能瓶颈.

I have a shell script in which I need to check whether two files contain the same data or not. I do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck.

以下是这行:

diff -q $dst $new > /dev/null

if ($status) then ...

是否可以有一种比较快速的方法来比较文件，也许是自定义算法而不是默认的diff?

Could there be a faster way to compare the files, maybe a custom algorithm instead of the default diff?

推荐答案

我相信cmp会在第一个字节差处停止:

I believe cmp will stop at the first byte difference:

cmp --silent $old $new || echo "files are different"

这篇关于判断两个文件在Unix/Linux中是否具有相同内容的最快方法?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！