使用comm来区分两个文件 [英] using comm to diff two files

问题描述

我正在尝试使用comm来计算两个已排序文件之间的差异，但是结果没有意义，怎么了?我想显示在test2中但不在test1中的字符串，然后显示在test1中但不在test2中的字符串

I am trying to use comm to compute the difference between two sorted files, however the result doesn't make sense, what's wrong? I want to show the strings that exists in test2 but not test1, and then show the strings that exist in test1 but not test2

>test1
a
b
d
g

>test2
e
g 
k
p

>comm test1 test2
a
b
d
    e
g
    g 
    k
    p

推荐答案

要显示 test2 中存在的行，而不显示 test1 中存在的行，请编写以下任意一项:

To show the lines that exist in test2 but not in test1, write either of these:

comm -13 test1 test2
comm -23 test2 test1

( -1 隐藏仅在第一个文件中存在的行的列； -2 隐藏仅在第二个文件中存在的行的列； -3 用两个文件中都存在的行隐藏该列.)

(-1 hides the column with lines that exist only in the first file; -2 hides the column with lines that exist only in the second file; -3 hides the column with lines that exist in both files.)

反之亦然，以显示存在于 test1 中但不存在于 test2 中的行.

And, vice versa to show the lines that exist in test1 but not in test2.

请注意，一行上的 g 本身被认为与 g 不同，后跟一个空格，这就是为什么获得

Note that g on a line by itself is considered distinct from g with a space after it, which is why you get

g
    g 

代替

        g

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