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Top Forums Shell Programming and Scripting Read column values from previous and next line using awk Post 302708921 by Nishi_Licious on Tuesday 2nd of October 2012 11:57:17 AM
Old 10-02-2012
Read column values from previous and next line using awk

Hi,

I have a csv file which contains data that looks something like this:

Code:
Key1 Key2 Key3 New_Key1 New_Key2 New_Key3
102   30      0        -                 -                  -
102   40      1        30               40               50
102   50      2        40               50               30
103   12      0        -                 -                  -
103   15      1        12              15               12

I need to fill in New_Key1, New_Key2 and New_Key3 based on the existing data taken from column Key2 keeping Key1 as the reference. A set of values of Key2 can be mapped to Key1. Like we have 30, 40 and 50 are mapped to Key1=102. Using this I need to fill in for New_Key1, New_Key2 and New_Key3. Here for my first row the New_Key1, New_Key2 and New_Key3 need to be dashed out. The value of New_Key1 on the second row is same as the 1st value of Key2(old) and the value of New_Key3 will be same as the 3rd value of Key2(new future value). While the value of New_Key2 will be same as the current value of Key2. Similarly for the next set of rows mapping to the same Key1 the process needs to repeat. But there's one more thing to it...The last value of New_Key3 will be the same as the first value of Key2. I hope my explanation is not confusing. Smilie

I want to this the awk way..but i'm kind of stuck. It might need me to use many more commands than is required. Please help me out!! Smilie

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Last edited by Corona688; 10-02-2012 at 01:13 PM..
 

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ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)
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