如何查找文件中的重复行？

Question

我有一个带有 foillowing 数据的输入文件：

line1
line2
line3
begin
line5
line6
line7
end
line9
line1
line3

我试图找到所有重复的行，我试过了

sort filename | uniq -c

但似乎对我不起作用:

它给了我：

  1 begin
  1 end
  1 line1
  1 line1
  1 line2
  1 line3
  1 line3
  1 line5
  1 line6
  1 line7
  1 line9

问题可能看起来重复 Find duplicate lines in a file and count how many time each line was duplicated? 但输入数据的性质不同。

请推荐。

Answer 1

使用这个：

sort filename | uniq -d
man uniq

How to find duplicate lines in a file?