liunx之grep

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liunx命令之grep#

gerp老三 过滤的需要的内容

[root@oldboy56-201 oldboy]# grep  oldboy oldboy.txt
I am oldboy teacher!
my blog is http://oldboy.blog.51cto.com 
our size is http://blog.oldboyedu.com 
[root@oldboy56-201 oldboy]# 

grep[-acinv] 搜索字符串 filename

grep：一般常用参数 -i和-v和-n为特级常用参数

1. -a：在二进制文件中，一文本文件的方式搜索数据
   [root@oldboy56-201 oldboy]# grep -a
   oldboy oldboy.txt
   I am oldboy teacher!
   my blog is http://oldboy.blog.51cto.com
   our size is http://blog.oldboyedu.com

2. -c：计算找到’搜索的字符串’ 的次数
   [root@oldboy56-201 oldboy]# grep -c oldboy
   3

3. -o：仅显示匹配的内容在其行首显示行号

4. -v：反向选择，即显示没有’搜索字符串’内容的那一行
   [root@oldboy56-201 oldboy]# grep -v ‘oldboy’ oldboy.txt
   ldmam
   this is boy
   this is boy
   I teach linux.

    	I like badminton ball ,billiard ball and chinese chess!
    	my qq is 49000448
    	
    	not 4900000448.
    	my god ,i am not oldbey,but OLDBOY!
    	job jb joooob
   

5. -E：扩展egrep

6. -color=autu：以特定颜色高亮显示匹配关键字

7. -i 忽略大小写（ignore case）
   [root@oldboy56-201 oldboy]# grep -i ‘oldboy’ oldboy.txt
   I am oldboy teacher!
   my blog is http://oldboy.blog.51cto.com
   our size is http://blog.oldboyedu.com
   my god ,i am not oldbey,but OLDBOY!

扩展正则表达式

• 1 +：一个或者一个以上(* 0个或者多个以上)
• 2 |：同时过滤多个字符串
  [root@oldboy56-201 oldboy]# egrep ‘0|oldboy’ oldboy.txt
  I am oldboy teacher!
  my blog is http://oldboy.blog.51cto.com
  our size is http://blog.oldboyedu.com
  my qq is 49000448
  not 4900000448.
• 3 ()后项引用