Delete between 10th character and 20th character

Hi,

I have a .txt and I need to delete the characters betwwen the 10th and 20th...

How can I do that...

I need to do somethink like these:

%s/I don't know how to define a range between 10th and 20th character//g

Can you help me...

If I want the 10 first characters i do this:
%s/..........^//g

Thank you very much

Regards,
Nuno Oliveira

will this work for you? You may need to adjust 200 to whatever your maximum line length is.

 cut -c1-9,21-200 data.txt

There's no need to adjust anything; just leave out the last parameter:

cut -c1-9,21- data.txt