在文件中查找到最后一个匹配的行，然后插入一新行

sncchen

1. $ tac 1.txt | sed '0,/Listen/{s/Listen.*/Listen 8006\n&/}' | tac
   
2. 123
   
3. 45678
   
4. 
   
5. 999999999
   
6. Listen 8001
   
7. Listen 8002
   
8. Listen 8003
   
9. Listen 8004
   
10. Listen 8005
    
11. Listen 8006
    
12. aaaaaaaaaaaaaaaaaaaaaaaaaa
    
13. bbbbbbbb   vvvvvvvvvvvvvvv
    
14. 
    
15. ccccccccccccccccccccccccccccccccccccccccccccc
    

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ref:  
http://stackoverflow.com/questio ... ccurrence-in-a-file
http://stackoverflow.com/questio ... -last-match-pattern