如何使用 BASH 比较两个文本文件的相同文本？
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How to compare two text files for the same exact text using BASH?
提问by user1742682
Let's say I have two text files that I need to extract data out of. The text of the two files is as follows:
假设我有两个文本文件需要从中提取数据。两个文件的正文如下：
File 1:
文件 1：
1name - [email protected]
2Name - [email protected]
3Name - [email protected]
4Name - [email protected]
File 2:
文件2：
email.com
email.com
email.com
anotherwebsite.com
File 2 is File 1's list of domain names, extracted from the email addresses. These are not the same domain names by any means, and are quite random.
文件 2 是文件 1 的域名列表，从电子邮件地址中提取。这些无论如何都不是相同的域名，并且非常随机。
How can I get the results of the domain names that match File 2 from File 1?
如何从文件 1 中获取与文件 2 匹配的域名的结果？
Thank you in advance!
先感谢您！
回答by zwol
Assuming that order does not matter,
假设顺序无关紧要，
grep -F -f FILE2 FILE1
should do the trick. (This works because of a little-known fact: the -Foption to grepdoesn't just mean "match this fixed string," it means "match any of these newline-separated fixed strings.")
应该做的伎俩。（这是因为一个鲜为人知的事实：-F选项grep不仅仅意味着“匹配这个固定字符串”，它还意味着“匹配任何这些以换行符分隔的固定字符串。”）
回答by Serge
The recipe:
食谱：
join <(sed 's/^.*@//' file1|sort -u) <(sort -u file2)
it will output the intersection of all domain names in file1 and file2
它将输出file1和file2中所有域名的交集
回答by ormaaj
See BashFAQ/036for the list of usual solutions to this type of problem.
有关此类问题的常用解决方案列表，请参阅BashFAQ/036。
回答by Srujan Kumar Gulla
Use VimDIFF command, this gives a nice presentation of difference
使用 VimDIFF 命令，这很好地展示了差异
回答by nemo
If I got you right, you want to filter for all addresses with the host mentioned in File 2.
如果我猜对了，您想过滤文件 2 中提到的主机的所有地址。
You could then just loop over File 2and grep for @<line>, accumulating the result in a new file or something similar.
然后你可以循环File 2并 grep for @<line>，将结果累积到一个新文件或类似的东西中。
Example:
例子：
cat file2 | sort -u | while read host; do grep "@$host" file1; done > filtered
