文本处理。大虾看看

vectorT

样例如下：
[a]
smp1 = what do i do
smp2 = how do you think
smp3 = did it work
[b]
smp1 = what do i do
smp2 = how do you think
smp3 = did it work
[c]
smp1 = what do i do
smp2 = how do you think
smp3 = did it work
[d]
smp1 = what do i do
smp2 = how do you think
smp3 = did it work



怎样才能将[c]条目下的smp2 = how do you think 中的you 替换为I呢？

jason680

回复 1# vectorT

s for section
k for keyword

change "old" to "new" when got the right section and keyword

$ awk 'BEGIN{s="c";k="smp2";old="you";new="I"}
/^\[/{S=($1=="["s"]")?1:0}
S&&$1==k{sub(old,new)}1' file

1. [a]
   
2. smp1 = what do i do
   
3. smp2 = how do you think
   
4. smp3 = did it work
   
5. [b]
   
6. smp1 = what do i do
   
7. smp2 = how do you think
   
8. smp3 = did it work
   
9. [c]
   
10. smp1 = what do i do
    
11. smp2 = how do I think
    
12. smp3 = did it work
    
13. [d]
    
14. smp1 = what do i do
    
15. smp2 = how do you think
    
16. smp3 = did it work
    

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dahaoshanhe

1. awk  '{if($1~/c/){print $1; getline a;print a;print "samp2= ho do i think ";getline ;getline b; print b}else{print $0}}' file

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野蛮打法

vectorT

回复 3# dahaoshanhe


    呵呵 其实我这个只是样本数据，真实数据远比这个复杂，所以该方法不可用 呵呵

vectorT

回复 2# jason680


    感谢回复，但是使用该方法并未生效，或许是自己为理解该方法，是否可以解释一下？

vectorT

回复 6# zooyo


    还是不行哦  呵呵  我自己想了个方法 虽然有点土但是还能用。问题是怎样用awk打印出指定范围内的最后一行

yestreenstars

1. awk '/\[c\]/{a=1;print;next}a&&/^smp2/{sub(/you/,"I");a=0}1'

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jason680

回复 5# vectorT

I said it already...

s for section
k for keyword

follow awk code function is:
change old("you") to new("I") when got the right section and keyword

$ awk 'BEGIN{s="c";k="smp2";old="you";new="I"}
/^\[/{S=($1=="["s"]")?1:0}
S&&$1==k{sub(old,new)}1' file
   
Note: you can't use included space in section and keyword
and can't use special word in old and new variable

yestreenstars

回复 9# jason680


    Jason，真佩服你的英文~请问你是不是华侨或者在外企工作？