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Top Forums Shell Programming and Scripting Print consecutive numbers in column2 Post 302599122 by jacobs.smith on Thursday 16th of February 2012 09:35:12 AM
Old 02-16-2012
Quote:
Originally Posted by Corona688
Code:
awk '$2=NR' inputfile

Under some systems, particularly solaris, you'll need to use nawk, since its awk is an old-fashioned implementation with a severe restriction on the maximum sizes of lines and number of columns it can use. They keep it for backwards compatibility and hide the 'good stuff' in strange places.
It print the output in this way

op from code
Quote:
1 1 3 4
2 2 4 5
4 3 6 7
3 4 17 19
But, I needed was

Desired output
Quote:
1 1 3 4
2 2 4 5
4 1 6 7
3 2 17 19
---------- Post updated at 09:35 AM ---------- Previous update was at 09:31 AM ----------

Quote:
Originally Posted by chihung
Code:
awk '{$2=NR%2+1;print}' inputfile

Chihung,

Thanks for the code.

It prints


Quote:
1 2 3 4
2 1 4 5
4 2 6 7
3 1 17 19
instead of


Quote:
1 1 3 4
2 2 4 5
4 1 6 7
3 2 17 19
 

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ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME
ppmtopgm - convert a portable pixmap into a portable graymap SYNOPSIS
ppmtopgm [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b. Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original colors, not necessarily a way that looks like a black and white photograph. QUOTE
Cold-hearted orb that rules the night Removes the colors from our sight Red is gray, and yellow white But we decide which is right And which is a quantization error. SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 10 April 2000 ppmtopgm(1)
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