Linux 如何做相反的差异？
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How to do the opposite of diff?
提问by Justin Yoder
Possible Duplicate:
how to show lines in common (reverse diff)?
可能的重复：
如何显示共同的行（反向差异）？
Is there a command to do the opposite of diff? I want to compare two files if the same thing exists in both create a list of them. i am trying to figure out what entry's exist in both files.
是否有命令可以执行与 diff 相反的操作？如果两个文件中存在相同的东西，我想比较两个文件，创建它们的列表。我想弄清楚这两个文件中都存在哪些条目。
回答by Frank Schmitt
Use the join command:
使用连接命令：
join a.txt b.txt
join a.txt b.txt
assuming the files are sorted; if not:
假设文件已排序；如果不：
sort a.txt > sorted_a.txt; sort b.txt > sorted_b.txt; join sorted_a.txt sorted_b.txt
回答by fge
Here is a solution that WILL NOT change the order of the lines:
这是一个不会改变行顺序的解决方案：
fgrep -x -f file1 file2
