请问怎么向上取三行?

jiejie455

1. jiema@HGHDTPBGWBT8 ~$cat data
   
2. 1
   
3. 2
   
4. 3
   
5. 4
   
6. 5
   
7. 6
   
8. 7
   
9. 8
   
10. 10
    
11. 11
    
12. 7
    
13. 141
    
14. 134
    
15. 123
    
16. 123
    
17. 7
    
18. 7

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1. awk -vkey=7 'BEGIN{a="";b="";c="";d=""}{d=$1;str=a"\n"b"\n"c"\n"d"END";if(str ~ key"END"){print a"\n"b"\n"c"\n------"};str="";a=b;b=c;c=d}' data

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