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Full Discussion: Add 1 million columns
Top Forums UNIX for Dummies Questions & Answers Add 1 million columns Post 302916178 by zajtat on Monday 8th of September 2014 04:22:23 AM
Old 09-08-2014
Add 1 million columns
Hi,

here is my problem:

I've got a file with 6 columns (file1):

Code:
a b c d e f
a b c d e f
a b c d e f
a b c d e f

I need to add 1 million columns to this file, each column needs to be a zero.
Here is how the result file (file2) should look like (for the sake of the example, I've only added 4 columns instead of the million):

Code:
a b c d e f 0 0 0 0
a b c d e f 0 0 0 0
a b c d e f 0 0 0 0
a b c d e f 0 0 0 0

I'm trying to solve this with awk. Here is what I've got so far:
Code:
awk '{for(i=7;i<=1000000;i++);$i=($i)?$i:"0"}1' file1 > file2

It doesn't really work.

Any help will be greatly appreciated!
Last edited by vbe; 09-08-2014 at 05:31 AM.. Reason: code tags please, not HTML
 

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LEARN ABOUT LINUX

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD
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