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Full Discussion: Compare to files and export only different values
Top Forums Shell Programming and Scripting Compare to files and export only different values Post 302469370 by DGPickett on Friday 5th of November 2010 04:36:53 PM
Old 11-05-2010
Well, take it in pieces. Most tools are line oriented. As the lines come in, they can be rewritten in a form more friendly to comparison, like:

recNo|Name|title|value
1|George/Brown|Value2|type2

Then, you can sort them and run the two files through comm -3 to get lines like this (\t is tab):

\t2|John/Cash|Value|14
2|John/Cash|Value|17

Then, a sed script can marry the lines back together and create your format (if you are fussy). One challenge is the the file 2 line may sort low, and come out first, as in my example. Also, output will not be in original order, but sorted ascending binary order.

Writing a merge routine is a bit much for scripts, but it can be done. Many programmers muff the logic even in more powerful languages, so using off the shelf tools is a big win.

Maybe the awk guys have a way to deal with it. How invariant is the format? Can lines come and go or move around. Your example has 2 different headers on rec no.
 

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LEARN ABOUT DEBIAN

mincdiff

MINCDIFF(1)							 MINC User's Guide						       MINCDIFF(1)

NAME

       mincdiff - report differences between minc files

SYNOPSIS

       mincdiff [-header|-body] [-l] [diff options] file1 file2

DESCRIPTION

       The  mincdiff  shell  script compares two minc files by running diff(1) on the headers of the two minc files, and cmp(1) on the image vari-
       able.  You can view only the header differences using -header or only the body (image variable) differences using -body.  The option -l	is
       passed on to cmp of the image variable.	Any unrecognized options (e.g. -u) are passed verbatim to the diff of the headers.

OPTIONS

       -header Compare only the headers of the two files.

       -body Compare only the image data of the two files.

       -l Print the byte offset in decimal and the byte value in octal
	      for each difference encountered in the image variable.

AUTHOR

       Peter Neelin

COPYRIGHTS

       Copyright (C) 1993 by Peter Neelin

SEE ALSO

       diff(1), cmp(1).

							   $Date: 2004-05-20 21:52:08 $ 					       MINCDIFF(1)
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