How to subtract only the lines with 2 numerical columns 2

[whatisthis987]

Hi,
I have a file that looks like this:

line1 - This is line #1
line1 - This is line #1
11 11 11
500 600
600 700
700 800
line7 - This is line #7
line8 - This is line #8

I would like to subtract 10 ONLY from the lines with 2 numerical columns. Meaning it should look like this:

line1 - This is line #1
line1 - This is line #1
11 11 11
450 500
500 600
600 700
line7 - This is line #7
line8 - This is line #8

Can anyone help?

 

[feherke]

Hi

I would like to subtract 10

Sure you want 10 ? Your example is closer to 100.

450 500

Sure you want 450 ? According to you, should be 490, according to me, should be 400.

Assuming all 2 column lines are numeric :

awk 'NF==2{$1-=100;$2-=100}1' /input/file

Also checking for numeric values :

awk '/^[[:digit:]]+[[:space:]]+[[:digit:]]+$/{$1-=100;$2-=100}1' /input/file

awk '/^[0-9]+ +[0-9]+$/{$1-=100;$2-=100}1' /input/file

Feherke.

http://rootshell.be/~feherke/

 

[whatisthis987]

Thank you so much. That's exactly what I wanted. Really appreaciate your help.