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Top Forums Shell Programming and Scripting awk print even fields of file Post 302973255 by RudiC on Monday 16th of May 2016 02:38:30 PM
Old 05-16-2016
How about (quick and dirty):
Code:
awk '{ for (i=3;i<=NF;i+=2) $i="" } 1' input.txt
ID X1  X2  X3  X4
A 700  1200  400  1300
B 2000  1000  2000  600
C 1400  200  1000  1200
D 1300  500  600  200

$i = "" empties the respective field regardless of loop.
(i=1; sets the loop's start value, irrespective of the increment. The odd fields are emptied which is the desired action.
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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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