1、测试文件
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f s d g d e w f g e k
2、直接使用diff
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# diff a.txt b.txt
3、修改b.txt测试
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f s d g d e xxx w f g e k [root@centos79 test]# diff a.txt b.txt ## 以b.txt文件为参照， a.txt文件的第二行改为 。。。才和b.txt一样 2c2 < s d g d e --- > s d g d e xxx
4、-i选项忽略大小写
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f s d g d E w f g e k [root@centos79 test]# diff a.txt b.txt 2c2 < s d g d e --- > s d g d E [root@centos79 test]# diff -i a.txt b.txt
5、-B选项忽略空行
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# diff a.txt b.txt 2a3,4 > > [root@centos79 test]# diff -B a.txt b.txt
6、-b选项忽略空字符
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# diff a.txt b.txt 2c2 < s d g d e --- > s d g d e [root@centos79 test]# diff -b a.txt b.txt
7、d表示（delete）删除
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f [root@centos79 test]# diff a.txt b.txt ## 表示a.txt和b.txt文件相比，a.txt删除2、3行后才和b.txt的1行相同 2,3d1 < s d g d e < w f g e k
8、a表示append（追加）
[root@centos79 test]# cat a.txt 3 5 6 s f s d g d e w f g e k [root@centos79 test]# cat b.txt 3 5 6 s f [root@centos79 test]# diff b.txt a.txt ## 表示b.txt和a.txt文件相比，在b.txt第1行的后面追加2、3行才和a.txt相同 1a2,3 > s d g d e > w f g e k