Question

我是编程的第一时间，我试图找到两个文本文件的交集。

file1.txt
a a
a b
a a
a c

file2.txt
a a

我想在file1 file2中的file1中的行

中得到以下结果

a a
a a

我尝试在Linux中使用grep命令，但我不知道该怎么做。

Answer 1

我在这里看到类似的东西https://stackoverflow.com/a/36591385/4053813

< file1 xargs -I % grep -xF '%' file2

编辑：正如@Julien Lopez所指出的，我为grep命令添加了-xF选项。

Answer 2

使用grep：

grep -xFf file2.txt file1.txt

-F, --fixed-strings
          Interpret  PATTERN  as  a  list  of  fixed  strings (rather than
          regular expressions), separated by newlines, any of which is  to
          be matched.
-f FILE, --file=FILE
          Obtain patterns  from  FILE,  one  per  line.   The  empty  file
          contains zero patterns, and therefore matches nothing.
-x, --line-regexp
          Select only those matches that exactly  match  the  whole  line.
          This option has the same effect as anchoring the expression with
          ^ and $.

两个文件之间的交叉点

2 个答案: