diff：比较文件的差异

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diff：比较文件的差异

diff ：比较文件的差异

用法：diff [选项]... FILES
选项：-a ：逐行比较-i，-ignore-case		忽略文件内容中的大小写差异-Z，--ignore-trailing-space		忽略行尾的空白-b，--ignore-space-change	 忽略空白量的变化-w，--ignore-all-space		忽略所有空白-B，--ignore-blank-lines		忽略所有行均为空白的更改-r，--recursive		递归地比较找到的任何子目录-y，--by-by-side		指定宽度，并排显示-W，--width		和-y一起使用指定宽度

[root@host test]# cat file1
1
2aaabbb
ADS
[root@host test]# cat file2
12AAA
bbbads
678

• diff

[root@host test]# diff file1 file2
2c2
< 2
---
>  2
4,6c4,8
< aaa
<  bbb
< ADS
---          
> AAA
> bbb
>
> ads
> 678

• diff -y

[root@host test]# diff -y file1 file2
1                                                               1
2                                                             |  2aaa                                                           | AAAbbb                                                          | bbb
ADS                                                           |> ads> 678

• diff -y -W ：指定宽度

[root@host test]# diff -y -W 30 file1 file2
1               1
2             |  2aaa           | AAAbbb          | bbb
ADS           |> ads> 678

• diff -i ：忽略大小写差异

[root@host test]# diff -i -y -W 30 file1 file2
1               1
2             |  2aaa             AAAbbb          | bbb>
ADS             ads> 678

• diff -w ：忽略所有空白的差异

[root@host test]# diff -w -y -W 30 file1 file2
1               1
2                2aaa           | AAAbbb            bbb
ADS           |> ads> 678

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