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Top Forums Programming comparing two fields from two different files in AWK Post 302562868 by amarn on Saturday 8th of October 2011 05:58:11 PM
Old 10-08-2011
comparing two fields from two different files in AWK

Hi,

I have two files formatted as following:

File 1: (user_num_ID , realID) (the NR here is 41671)

Code:
1  cust_034_60
2  cust_80_91
3  cust_406_4

..
..

File 2: (realID , clusterNumber) (total NR here is 1000)

Code:
cust_034_60  2
cust_406_4   3
..
..

and i want to compare these two files based on File 1 $2 field and File 2 $1 field and get a resulting file like

File 3: (user_num_ID, realID, clusterNumber)
Code:
1 cust_034_60 2
3 cust_406_4 3
..
..
..

just to summarize:
Create a new file3
Find where file2 ($1) is equal to file1($2)
and print to file3 file1($1) and file2($1,$2) (as a single record)



since im new in awk, i've tried several suggestions from previous threads but it seems that im doing something wrong...

the latest one I've tried:

Code:
awk > file3 'NR==FNR{ _[$2]=$1 next}{print $0, _[$1,$2] }' file1 file2

surely im doing something wrong Smilie

Thanks in advance

Moderator's Comments:
Mod Comment Video tutorial on how to use code tags in The UNIX and Linux Forums.

Last edited by radoulov; 10-09-2011 at 06:06 AM..
 

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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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