[SOLVED] Substituting zeros with dots in 2nd and 3rd field of a text file.

iconig · 05-30-2012, 11:56 AM

Say I have this data ped.rc with fields;
1 0 0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
7 0 0
8 0 0
9 0 0
10 0 0
11 0 0
12 14 3
13 0 0
14 17 9

I am trying to replace the 2nd and 3rd fields that have only 0's with dots but leave others that are non zeros the way they are. Can anyone help me out. Thanks

Snark1994 · 05-30-2012, 12:36 PM

Right forum, wrong thread title

use a name that's descriptive of the problem. However, something like:

Code:

awk '{ if($2 == 0 && $3 ==0) { gsub( "0 0$", ". .", $0); } print }' ped.rc

should work.

grail · 05-30-2012, 12:49 PM

Do both the second and third have to be zero for a replacement or is it replace a zero in those fields no matter if both or one?
Here is an alternative assuming not both:

Code:

awk '{$2 = $2 == 0?".":$2;$3 = $3 == 0?".":$3}1' ped.rc

colucix · 05-30-2012, 12:56 PM

sed?

Code:

sed -r 's/^([0-9]+) 0 0$/\1 . ./' file

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Snark1994 · 05-30-2012, 01:38 PM

Quote:

Originally Posted by grail

Code:

awk '{$2 = $2 == 0?".":$2;$3 = $3 == 0?".":$3}1' ped.rc

Sorry to be a pain, but I don't understand your code (new to awk

it's one of the languages which I'm trying to make efforts to learn). What does the '1' at the end do? Does it just tell awk to print the line out, or is it something deeper than that? I understand the a?b:c constructs you've got.

grail · 05-30-2012, 01:50 PM

Quote:

Does it just tell awk to print the line out

Got it in one

Any expression not in braces is evaluated and if true the braces are entered, but if no braces then the default action is performed, which is print.

colucix · 05-30-2012, 02:03 PM

Quote:

Originally Posted by grail

Got it in one

Any expression not in braces is evaluated and if true the braces are entered, but if no braces then the default action is performed, which is print.

In addition it's worth to mention what is true and false in awk

iconig · 05-30-2012, 02:59 PM

Hey thanks, I used the awk and it worked

grail · 05-31-2012, 01:57 AM

Please mark as SOLVED once you have a solution.

Snark1994 · 05-31-2012, 09:19 AM

Thanks grail and colucix