bash中两个字符串之间的差异答案

【问题标题】：diff between two strings in bashbash中两个字符串之间的差异
【发布时间】：2017-01-26 22:21:54
【问题描述】：

我有两个包含信息行的字符串。我想获得两个字符串中不同的行。例子：字符串1：

"This is line1
This is line2
This is line3"

字符串2：

"This is line1
This is linex
This is line2"

预期结果：

diff string1 string2 is:
"This is line3"

diff string2 string1 is:
"This is linex"

【问题讨论】：

标签： bash diff

【解决方案1】：

你可以使用comm:

$ str1="This is line1
> This is line2
> This is line3"
$ str2="This is line1
> This is linex
> This is line2"

$ comm -23 <(echo "$str1" | sort) <(echo "$str2" | sort)
This is line3
$ comm -23 <(echo "$str2" | sort) <(echo "$str1" | sort)
This is linex

【讨论】：

【解决方案2】：

你可以用diff做你想做的事

$ str1="This is line1\nThis is line2\nThis is line3"; str2="This is line1\nThis is linex\nThis is line2";
$
$ diff -y -W 30 --suppress-common-lines <(echo -e $str1) <(echo -e $str2)
              > This is linex
This is line3 <

受此问题和答案的启发：Bash string difference

【讨论】：