awk print 的一个教训

Glue

cat machinefile
machine1:4
machine2:4
machine3:2
machine4:2

要换成
machine1:1
machine2:1
machine3:1
machine4:1

1. cat machine | awk 'BEGIN {FS=":"} {print $1,"\b:1"}'

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这段显示出来完全正确，可是 > 文件后，变成了

machine1 ^H:1
machine2 ^H:1
machine3 ^H:1
machine4 ^H:1

:ask

经过一翻 man awk，原来这样才正确，

1. cat machine | awk 'BEGIN {FS=":"} {print $1":1"}'

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更复杂的就要用 printf 了，居然也有 printf  :cool:

kiron

想不明白为何你要用退格符？

zhy2111314

这样岂不是简单点:

1. zhyfly@zhyfly:~/bash$ cat matchfile
   
2. machine1:4
   
3. machine2:4
   
4. machine3:2
   
5. machine4:2
   
6. zhyfly@zhyfly:~/bash$ cat matchfile|awk -F: '$2=1'>"matchfile"
   
7. zhyfly@zhyfly:~/bash$ cat matchfile
   
8. machine1 1
   
9. machine2 1
   
10. machine3 1
    
11. machine4 1
    
12. zhyfly@zhyfly:~/bash$
    

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鱼儿小

直接在vi里用命令替换多简单啊

Freebird

Just:
%sed 's/[42]$/1/g'  matchfile > matchfile.new

DSL

1. 
   
2. perl -pi -e 's/[\d ]$/1/g' file

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Freebird

Post by DSL

1. 
   
2. perl -pi -e 's/[\d ]$/1/g' file

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实践证明不行. :ask

DSL

Post by Freebird
实践证明不行. :ask

1. 
   
2. /home/lee#cat temp
   
3. machine1:4
   
4. machine2:4
   
5. machine3:2
   
6. machine4:2
   
7. /home/lee#perl -pi -e 's/[\d ]$/1/g' temp
   
8. /home/lee#cat temp
   
9. machine1:1
   
10. machine2:1
    
11. machine3:1
    
12. machine4:1

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Freebird

Post by DSL

1. 
   
2. /home/lee#cat temp
   
3. machine1:4
   
4. machine2:4
   
5. machine3:2
   
6. machine4:2
   
7. /home/lee#perl -pi -e 's/[\d ]$/1/g' temp
   
8. /home/lee#cat temp
   
9. machine1:1
   
10. machine2:1
    
11. machine3:1
    
12. machine4:1

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丫的我就是不行

DSL

Post by Freebird
丫的我就是不行

哈哈,就知道你不行,给你来点"蚁力神"你就行啦