grep的过滤使用

已知文件test里有以下内容

[[email protected] /]# cat test
yuni
yunwei
YUNWEI
YWEI
yunjijsuan
yunsuan
YUNJISUAN

1.只显示匹配的内容

[[email protected] /]# cat test | grep -o yunwei
yunwei

2.忽略大小写

[[email protected] /]# cat test | grep -i yunwei
yunwei
YUNWEI

3.目标排序

[[email protected] /]# cat test | grep -in yunwei
2:yunwei
3:YUNWEI

4.精确匹配

4.1输入错误

[[email protected] /]# cat test | grep -w yunwe
[[email protected] /]# 

4.2正确输入

[[email protected] /]# cat test | grep -w yunwei
yunwei

5.排除某个文件输出其它

[[email protected] /]# cat test | grep -v yunwei
yuni
YUNWEI
YWEI
yunjijsuan
yunsuan
YUNJISUAN