bash 如何比较两个巨大的文本文件（每个超过 50GB）？
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How to compare two huge text files (more than 50gb each)?
提问by sara
I have 2 huge text files and want to find the difference between them? What is the fast command/ utility/ or script to do this job?
我有 2 个巨大的文本文件，想找出它们之间的区别吗？完成这项工作的快速命令/实用程序/或脚本是什么？
I try using unix diffbut, it failed for huge files. It show me "Permission Denied"
我尝试使用unix diff，但是对于大文件却失败了。它告诉我"Permission Denied"
Also, I try unix bdiff(as I read that is good for huge files) but, I did not complete test it because it show me "bdiff: command not found"
另外，我尝试过unix bdiff（因为我读到这对大文件很有用）但是，我没有完成测试，因为它显示了我"bdiff: command not found"
Also, I try windows FC(file compare) but, I did not know how to show the output in a new text file. The result output in the cmd and I can't figure it all.
另外，我尝试了windows FC（文件比较）但是，我不知道如何在新的文本文件中显示输出。cmd中的结果输出，我无法全部弄清楚。
Any suggestion will help me a lot. Please help me in this matter.
任何建议都会对我有很大帮助。请帮助我解决这个问题。
Thanks a lot.
非常感谢。
回答by SLePort
You can try diffwith the --speed-large-filesoption :
您可以尝试diff使用以下--speed-large-files选项：
diff --speed-large-files file1 file2
cmpis another alternative (compare files byte by byte) :
cmp是另一种选择（逐字节比较文件）：
cmp file1 file2
回答by Munir
If fcworks for you, you can send the output of fcto text file with:
如果fc适合您，您可以将输出发送fc到文本文件：
fc file1 file2 >output.txt
