精确匹配字符串

oldknew

有一文本 md5_a.txt,内容如下:
...
4f4e87d9e9b723da22f89491cb2d758d  dsfsdf3r32 /etc/hosts.deny
b5af3a51cf37ad85f638fcde51732862  /etc/hosts  sfjjsfjs fdsfdfd
3fb7d181e3e605ca91541c0d82753616 fdsf313r  /etc/hosts.allow sdfsd
...
如何才能精确取到包含有"/etc/hosts"的那行?

cfwyy

1. grep -P '\s/etc/hosts\s' md5_a.txt
   

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legs

grep ' /etc/hosts ' md5_a.txt

oldknew

不精确匹配,三条记录都搜出来了

chengchow

1. [root@bigdata121 ~]# grep -P "(?<=\s)/etc/hosts(?=\s)" aa.log
   
2. b5af3a51cf37ad85f638fcde51732862  /etc/hosts  sfjjsfjs fdsfdfd
   
3. [root@bigdata121 ~]# cat aa.log
   
4. 4f4e87d9e9b723da22f89491cb2d758d  dsfsdf3r32 /etc/hosts.deny
   
5. b5af3a51cf37ad85f638fcde51732862  /etc/hosts  sfjjsfjs fdsfdfd
   
6. 3fb7d181e3e605ca91541c0d82753616 fdsf313r  /etc/hosts.allow sdfsd

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