Text search command
Article Directory
learning target
- To know the commands used in text search
Use 1. grep command
| command | Explanation |
|---|---|
| grep | Text search |
grep command renderings:
![[Image dump the chain fails, the source station may have security chain mechanism, it is recommended to save the picture down uploaded directly (img-L7Gbca7D-1583934593482) (imgs / grep.png)]](https://img-blog.csdnimg.cn/20200311215033160.png)
Use 2. grep command options
| Command Options | Explanation |
|---|---|
| -i | Ignore case |
| -n | Display line numbers match |
| -v | Display does not contain matching text of all lines |
-i command options renderings:
![[Image dump the chain fails, the source station may have security chain mechanism, it is recommended to save the picture down uploaded directly (img-8E7wLr35-1583934593482) (imgs / grep% E9% 80% 89% E9% A1% B9-1.png )]](https://img-blog.csdnimg.cn/20200311215028291.png)
-n command option renderings:
![[Image dump the chain fails, the source station may have security chain mechanism, it is recommended to save the picture down uploaded directly (img-9apOfT1G-1583934593483) (imgs / grep% E9% 80% 89% E9% A1% B9-2.png )]](https://img-blog.csdnimg.cn/20200311215024646.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDU2MDQ1,size_16,color_FFFFFF,t_70)
-v command options renderings:
![[Image dump the chain fails, the source station may have security chain mechanism, it is recommended to save the picture down uploaded directly (img-IUxVf76n-1583934593483) (imgs / grep% E9% 80% 89% E9% A1% B9-3.png )]](https://img-blog.csdnimg.cn/20200311215020982.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDU2MDQ1,size_16,color_FFFFFF,t_70)
3. grep command in conjunction with regular expressions
| Regular Expressions | Explanation |
|---|---|
| ^ | Beginning with the specified string |
| $ | End with the specified string |
| . | A non-matching character newline |
Regular expression '^' renderings:
![[Image dump the chain fails, the source station may have security chain mechanism, it is recommended to save the picture down uploaded directly (img-WDeyFAy2-1583934593483) (imgs / grep% E6% AD% A3% E5% 88% 99-1.png )]](https://img-blog.csdnimg.cn/20200311215015502.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDU2MDQ1,size_16,color_FFFFFF,t_70)
Regular expression '$' renderings:
![[Image dump the chain fails, the source station may have security chain mechanism, it is recommended to save the picture down uploaded directly (img-JxUgsK7w-1583934593484) (imgs / grep% E6% AD% A3% E5% 88% 99-2.png )]](https://img-blog.csdnimg.cn/20200311215010526.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1NDU2MDQ1,size_16,color_FFFFFF,t_70)
'.' Renderings regular expression:
![[Image dump the chain fails, the source station may have security chain mechanism, it is recommended to save the picture down uploaded directly (img-qLvVjREr-1583934593484) (imgs / grep% E6% AD% A3% E5% 88% 99-3.png )]](https://img-blog.csdnimg.cn/20200311215006318.png)
4. Extension
- grep command can also search for text content in the pipeline, such as: LS / | grep 'lib'
- Using grep can also search the contents of quotation marks omitted when the command, such as: LS / | grep lib , grep the Hello 1.txt
5. Summary
- grep command is completed text search operation
- Format text search: grep text search options content
