删除指定文件段

r2007

我还有更简单的^_^

1. r2007@www r2007 $ sed '1,4d' file
   
2. begin time 20040303
   
3. first wang
   
4. second zhu
   
5. end time
   

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bjgirl

[quote]原帖由 "r2007"][/quote 发表：


cat file
begin time 20040303
first wang
second zhu
end time
n time 20040303
first wang
second zhu
end time
begin time 20040303
first zhang
second liu
end time
begin time 20040303
first wang
second zhu
end time
begin time 20040303
first wang
second zhu
end time
begin time 20040303
first wang
second zhu
end time
begin time 20040303
first wang
second zhu
end time
try it ^_^
还是我的字母用的最少吧!
grep -B2 -A1 "second [^liu]" file

r2007

哈哈，擅自修改楼主的样本，我也改一下^_^
这段应该符合楼主的描述吧？MM那个恐怕失效了吧？

1. r2007@www r2007 $ cat a
   
2. begin time 20040303
   
3. first wang
   
4. second zhu
   
5. end time
   
6. begin time 20040303
   
7. first first ha ha
   
8. first zhang
   
9. second liu
   
10. third r2007
    
11. last bjmm
    
12. end time
    
13. begin time 20040303
    
14. first wang
    
15. second zhu
    
16. end time
    
17. r2007@www r2007 $ sed '/^begin time/{:a;N;/\nend time/bb;ba;:b;/\nsecond liu/d}' a         
    
18. begin time 20040303
    
19. first wang
    
20. second zhu
    
21. end time
    
22. begin time 20040303
    
23. first wang
    
24. second zhu
    
25. end time
    
26. r2007@www r2007 $
    
27. 
    

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bjgirl

就是比你强,看,原封不动,而且还自动加了分段符呢!

2. cat file
3. begin time 20040303
4. first wang
5. second zhu
6. end time
7. begin time 20040303
8. first first ha ha
9. first zhang
10. second liu
11. third r2007
12. last bjmm
13. end time
14. begin time 20040303
15. first wang
16. second zhu
17. end time
19. grep -B2 -A1 "second [^liu]" file
20. begin time 20040303
21. first wang
22. second zhu
23. end time
24. --
25. begin time 20040303
26. first wang
27. second zhu
28. end time

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你的行么?! xixi ^_^

r2007

败了。我加错地方了^_^

bjgirl

[quote]原帖由 "r2007"]败了。我加错地方了^_^[/quote 发表：

切,就知道欺负我!,不过很PF你的sed/awk编程能力的说

bjgirl

原帖由 "nkoldbug" 发表：


你的在偶的系统里用不了

那是grep版本的问题

john_student

r2007对sed的纯熟运用，哇。
PF!对你的敬仰之情有如滔滔江水。。。。。。