grep的过滤使用

已知文件test里有以下内容

[root@yangwenbo /]# cat test
yuni
yunwei
YUNWEI
YWEI
yunjijsuan
yunsuan
YUNJISUAN

1.只显示匹配的内容

[root@yangwenbo /]# cat test | grep -o yunwei
yunwei

2.忽略大小写

[root@yangwenbo /]# cat test | grep -i yunwei
yunwei
YUNWEI

3.目标排序

[root@yangwenbo /]# cat test | grep -in yunwei
2:yunwei
3:YUNWEI

4.精确匹配

4.1输入错误

[root@yangwenbo /]# cat test | grep -w yunwe
[root@yangwenbo /]# 

4.2正确输入

[root@yangwenbo /]# cat test | grep -w yunwei
yunwei

5.排除某个文件输出其它

[root@yangwenbo /]# cat test | grep -v yunwei
yuni
YUNWEI
YWEI
yunjijsuan
yunsuan
YUNJISUAN