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Thanks :)

I know that grep will display the matched line, but how about if I want to get the matched characted, for example:

file.txt contains:
Hello 123 World
This is a56 letter34
56are you su345re ?...

Hi,

I want to substitute variable in sed using combination of name and var_$name:

name=Tom
var_$name=1

sed -n "${var_"$name"}"p < myfile

but it doesn't work, do you know what's wrong ?...

The problem above is actually come from more complex problem that I am trying to solve. And please I can't figure it out ...

Say I have main file and three reference files.
The main file contain...

Thanks ! :)

Hi, Can someone help me ...

I have file that contain fields, e.g

Filename start end
top1.dat 10 15
top2.dat 3 5
top3.dat 0 8
top4.dat 9 12
...

I want to...