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Full Discussion: Add 8 columns at the end of .csv file using awk
Top Forums Shell Programming and Scripting Add 8 columns at the end of .csv file using awk Post 302939130 by Don Cragun on Monday 23rd of March 2015 04:38:29 AM
Old 03-23-2015
With your new input format, and assuming you want the added fields in the same numeric format, and adding the headers you requested; try:
Code:
awk '
BEGIN {	for(i = 1; i <= 8; i++) {
		$i = sprintf("x%d", i)
		$(8 + i) = sprintf("test_x%d", i)
		$(16 + i) = sprintf("mul_x%d", i)
	}
	FS = OFS = ","
	print
}
{	for(i = 9; i <= 16; i++)
		$(i + 8) = sprintf("%.18e", $i * 100)
}
1' input.csv > newfile.csv

which, with your latest single line sample input produces the output:
Code:
x1,x2,x3,x4,x5,x6,x7,x8,test_x1,test_x2,test_x3,test_x4,test_x5,test_x6,test_x7,test_x8,mul_x1,mul_x2,mul_x3,mul_x4,mul_x5,mul_x6,mul_x7,mul_x8
6.450000000000000000e+01,1.168750000000000000e+01,8.102425000000000000e+04,8.206250000000000000e+01,8.500000000000000000e+00,1.200000000000000000e+01,1.018750000000000000e+01,1.875000000000000000e+01,1.864400000000000000e+04,3.527000000000000000e+03,1.093483900000000000e+07,3.818700000000000000e+04,2.089000000000000000e+03,3.574000000000000000e+03,2.979000000000000000e+03,3.933000000000000000e+03,1.864400000000000000e+06,3.527000000000000000e+05,1.093483900000000000e+09,3.818700000000000000e+06,2.089000000000000000e+05,3.574000000000000000e+05,2.979000000000000000e+05,3.933000000000000000e+05

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk.

As for why your code was adding empty fields:
Code:
awk '...{for (i=1;i<=8;++i){$(NF+i)=$(i+8)*100;}}...'

Assuming that you start with an input record containing 16 fields, NF will initially be 16.
After the 1st time through the loop, NF will be 17 (16 + 1) with $17 set to $9 * 100.
After the 2nd time through the loop, NF will be 19 (17 + 2) with $19 set to $10 * 100.
After the 3rd time through the loop, NF will be 22 (19 + 3) with $22 set to $11 * 100.
...
After the 8th time through the loop, NF will be 52 (44 + 8) with $52 set to $16 * 100.
And all of the unset fields (18, 20, 21, 23, 24, 25, 27, ... 51) will default to the empty string.
 

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LEARN ABOUT DEBIAN

numsum

NUMSUM(1)						User Contributed Perl Documentation						 NUMSUM(1)

NAME

       numsum - numsum program file

SYNOPSIS

       numsum [-iIcdhrsvxy] <FILE>

       | numsum [-iIcdhrsvxy]	(Input on STDIN from pipeline.)

       numsum [-iIcdhrsvxy]	(Input on STDIN.  Use Ctrl-D to stop.)

DESCRIPTION

       numsum will take all the numbers on stdin and return the sum of those numbers.  Currently it only processes the first number on each line.
       Besides positive numbers, it also handles negative numbers and numbers with decimals.

OPTIONS

	   -i  Only return the integer portion of the final sum.
	   -I  Only return the decimal portion of the final sum.

	   -c	   Print out the sum of each column.
	   -r	   Print out the sum of each row.

	   -x <n>  Specify a comma seperated list of columns to print.
	   -y <n>  Specify a comma seperated list of rows to print.

	   -s <string> Specify a string to use as a seperator for columns.
		       This defaults to be consecutive whitespace (s+).

	   -h  Help: You're looking at it.
	   -V  Increase verbosity.
	   -d  Debug mode.  For developers
	   -q  Quiet mode, don't print any warnings.

EXAMPLES

       Simply add up the numbers in a file.
	   $ numsum numbers.txt
	   4315

       Enter your own numbers on STDIN. The last number is the answer.
	   $ numsum
	   4
	   21
	   98
	   100
	   223

       Use it in a command pipeline.
	   $ ls -1s | grep .mp3 | numsum -c -x 5
	   72288

       Add up the total byte count in a http log file.
	   $ cat access_log | awk {'print $10'} numsum

	   or

	   numsum -c -x 10 access_log

       Add up the columns of numbers of a file.

	   $ cat columns
	   1 6 11 16 21
	   2 7 12 17 22
	   3 8 13 18 23
	   4 9 14 19 24
	   5 10 15 20 25
	   $ numsum -c columns
	   15 40 65 90 115

       Add up the 1st, 2nd and 5th columns only.

	   $ numsum -c -x 1,2,5 columns
	   15 40 115

       Add up the rows of numbers of a file.

	    $ numsum -r columns
	    55
	    60
	    65
	    70
	    75

       Add up the 2nd and 4th rows.

	    $ numsum -r -y 2,4 columns
	    60
	    70

SEE ALSO

       numaverage(1), numbound(1), numinterval(1), numnormalize(1), numgrep(1), numprocess(1), numrandom(1), numrange(1), numround(1)

COPYRIGHT

       numsum is part of the num-utils package, which is copyrighted by Suso Banderas and released under the GPL license.  Please read the COPYING
       and LICENSE files that came with the num-utils package

	 Developers can read the GOALS file and contact me about providing
       submitions or help for the project.

MORE INFO

       More info on numsum can be found at:

       http://suso.suso.org/programs/num-utils/

perl v5.10.1							    2009-10-31								 NUMSUM(1)
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