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Full Discussion: Join 2 file using column 2 from each file
Top Forums Shell Programming and Scripting Join 2 file using column 2 from each file Post 302601404 by DGPickett on Thursday 23rd of February 2012 03:00:50 PM
Old 02-23-2012
To join, either you must store one file in a string addressable array and then look up the values in the second file, or sort the files and then merge the sorted data, still potentially Cartesian for duplicate keys, but your examples are keyed unique. For two unique files with all keys present in both, the sorted key merge is trivial.

Since you want to do a full outer join, in SQL-speak, use the -a option in join, and then deal with the odd lines by field count in post-processing, or a field marker field added in pre-processing (proprocess file a to be 'key a fest_of_fields' and file b to ve 'key b rest_of_fields'. The sort and join method is the most robust and versatile. It looks like your have a two column key, which can be merged by preprocessing so it is easy to restore in postprocessing. Commnds like sed or awk are great for both.

Another robust approach is to use SQL with a file to table load or a jdbc jar or odbc driver for text or csv, and do a literal SQL full outer join:
Code:
select
  case when a.f1 IS NULL then b.f1 else a.f1 end f1,
  case when a.f2 IS NULL then b.f2 else a.f2 end f2,
  b.f3,
  b.f4,
  b.f5,
  a.f3
 from
  file1 a
   full join file2 b
    on a.f2=b.f2
 order by
  case when a.f1 IS NULL then b.f1 else a.f1 end,
  case when a.f2 IS NULL then b.f2 else a.f2 end

Last edited by DGPickett; 02-24-2012 at 03:01 PM..
 

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LEARN ABOUT OSF1

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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