如何用sed实现这个？

axl_chan

file:
there is - 3 test data file -- you and me
there is - 4 test data file -- you and me
there is - 5 test data file -- you and me

希望能够用一句sed把它变成
there is -03 test data file -- you and me
there is -04 test data file -- you and me
there is -05 test data file -- you and me


其实就是将- X变成-0X
谢谢！

idkey

$ cat a
there is - 3 test data file -- you and me
there is - 4 test data file -- you and me
there is - 5 test data file -- you and me
$ cat a | sed 's/ - \([0-9]*\) / -0\1 /'
there is -03 test data file -- you and me
there is -04 test data file -- you and me
there is -05 test data file -- you and me

axl_chan

idkey:
非常感谢！

KornLee

use awk ;)
[/home/javalee/myshell]cat a
there is - 3 test data file -- you and me
there is - 4 test data file -- you and me
there is - 5 test data file -- you and me
[/home/javalee/myshell]cat a|tr -d -|awk '$3="-0"$3{print}'|awk '$7="-- "$7{print}'
there is -03 test data file -- you and me
there is -04 test data file -- you and me
there is -05 test data file -- you and me

idkey

最初由 javalee 发表
use awk ;)
[/home/javalee/myshell]cat a
there is - 3 test data file -- you and me
there is - 4 test data file -- you and me
there is - 5 test data file -- you and me
[/home/javalee/myshell]cat a|tr -d -|awk '$3="-0"$3{print}'|awk '$7="-- "$7{print}'
there is -03 test data file -- you and me
there is -04 test data file -- you and me
there is -05 test data file -- you and me

呵呵，看起来有点大炮打蚊子的感觉。

arkira

我是 新手也来凑个热闹，呵呵：
略有不同

sed 's/-\([0-9]\)/-0\1/' filename

axl_chan

呵呵，多谢各位支持！