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Full Discussion: compare columns from 2 files and merge
Top Forums UNIX for Dummies Questions & Answers compare columns from 2 files and merge Post 302347318 by samwilkinson on Tuesday 25th of August 2009 11:13:18 AM
Old 08-25-2009
compare columns from 2 files and merge
Dear all,

Being new to Unix i have a problem. I have 2 files:
File 1:

Code:
118,1,0,2,3,0,5,0.3,0,0.3,0.6,1
118,2,1,2,2,0,5,0.4,0,0.4,0.4,1
118,4,2,0,3,0,5,0.7,0,0.3,0.6,1
118,6,4,1,0,0,5,0.8,0,0.2,0,1

File 2:
Code:
118,1,BFGL-NGS-109695,3610326,0,18,1,0.556,0.389,0.056,0.25,0.8183
118,2,BFGL-NGS-109696,6200739,0,18,1,0.222,0.5,0.278,0.472,0.824,0
118,3,BFGL-NGS-109701,4560156,0,18,1,0,0.167,0.833,0.083,0.8567,0.
118,4,BFGL-NGS-109702,1990730,0,18,1,0,0,1,0,0.5299,0.3408,0.3408,
118,5,BFGL-NGS-109705,5050020,0,18,1,0.056,0.667,0.278,0.389,0.777
118,6,BFGL-NGS-109707,2000561,0,18,1,0.056,0.167,0.778,0.139,0.796
118,7,BFGL-NGS-109711,3140750,0,18,1,0.333,0.444,0.222,0.444,0.865

File 2 is longer than File 1. I wish to compare the contents of the two files by column 2. Where there is a match I wish to extract the line from File 2 and place it after corresponding line from File 1 thus creating a new file.

e.g.
Code:
118,1,0,2,3,0,5,0.3,0,0.3,0.6,1 118,1,BFGL-NGS-109695,3610326,0,18,1...

I have tried using awk for this
Code:
awk -F, 'BEGIN {while ((getline < "File2.txt") > 0) a[$1] = $2}

but i get lost afterwards on how to merge the corresponding extracted lines together. Any help would be much appreciated

Samantha
Last edited by vgersh99; 08-25-2009 at 01:58 PM.. Reason: code tags, PLEASE!
 

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LEARN ABOUT REDHAT

ppmtosixel

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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