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Delete certain column awk

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# 1  
Old 12-01-2011
Delete certain column awk
Hi experts,
I have a file, where inside this file contains multiple columns (up to 2000 columns):

Code:
0.05 0.54 2.02 0.21 1.39 2.92 0.31 1.75 3.34

I want to delete column 3,6,9,12,15,18,21... etc (any columns where can be divided from value 3),
so that results is like:

Code:
0.05 0.54 0.21 1.39 0.31 1.75

How can I do this ?
I have try :

Code:
awk '{ print $1, $2, $4, $5, $7, $8 }' OFS=' '

but I can not write manually columns no if I have 2000 columns.

Please help.
# 2  
Old 12-01-2011
Code:
nawk '{for(i=0;i<=NF;i=i+3){if(i!=0){printf("%s ",$i)}if(i==NF){printf("\n")}}}' inputfile

# 3  
Old 12-01-2011
The above commands did not delete the 3,6,9,.. etc columns, but print the 3,6,9.. columns.
# 4  
Old 12-01-2011
input.txt:
Code:
0.05 0.54 2.02 0.21 1.39 2.92 0.31 1.75 3.34
0.05 0.54 2.02 0.21 1.39 2.92 0.31 1.75 3.34
0.05 0.54 2.02 0.21 1.39 2.92 0.31 1.75 3.34

Code:
#! /usr/bin/perl -w
use strict;
my ($i, @x);
open I, "< input.txt";
open O, ">> output.txt";
for (<I>) {
    @x = split /\s+/,$_;
    for ($i=0; $i<=$#x; $i++) {
        (($i+1)%3 == 0) ? next : print O "$x[$i] ";
    }
    print O "\n";
}
close O;
close I;

output.txt:
Code:
0.05 0.54 0.21 1.39 0.31 1.75 
0.05 0.54 0.21 1.39 0.31 1.75 
0.05 0.54 0.21 1.39 0.31 1.75

# 5  
Old 12-01-2011
Quote:
Originally Posted by guns
The above commands did not delete the 3,6,9,.. etc columns, but print the 3,6,9.. columns.
Should be:
Code:
nawk '{for(i=1;i<=NF;i++){if(i%3!=0){printf("%s ",$i)}if(i==NF){printf("\n")}}}' inputfile

This User Gave Thanks to Franklin52 For This Post:
guns
# 6  
Old 12-01-2011
Working Perfectly. Thanks !!
# 7  
Old 12-01-2011
try this..

Code:
 
nawk '{for(i=0;i<=NF;i++){if(i!=0 && i%3!=0){printf("%s ",$i)}if(i==NF){printf("\n")}}}' inputfile

This User Gave Thanks to itkamaraj For This Post:
guns
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