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Top Forums Shell Programming and Scripting Compare Field in Current Line with Field in Previous Post 302612835 by moutaye on Monday 26th of March 2012 11:28:54 AM
Old 03-26-2012
Compare Field in Current Line with Field in Previous

Hi Guys

I have the following file

Quote:
1,A
2,A
3,A
4,B
5,B
6,C
Essentially, I am trying to find the right awk/sed syntax in order to produce the following 3 distinct files from the file above:

Quote:
1,A
2,A
3,A
Quote:
4,B
5,B
Quote:
6,C
Basically, I want to print the lines of the file as long as the second field of the current line is equal to the second field of the previous line. And i want to print them in a file called "second field".txt

Any help appreciated. Thanks.
 

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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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