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Full Discussion: Compare large file and identify difference in separate file
Top Forums Shell Programming and Scripting Compare large file and identify difference in separate file Post 302610447 by mjf on Wednesday 21st of March 2012 09:26:49 AM
Old 03-21-2012
jubaier,
Using the results of the diff command, you can select those records that were on file 1 but not on file 2 and vice versa and output results to individual files. As others have mentioned, you should sort before doing diff. For example:

Code:
diff file1.txt file2.txt 

2d1 
< HOME|NEWPORT STREET|1||NEW LISTING 
5c4 
< CAR|TOYOTA|4||NEW LISTING 
--- 
> CAR|TOYOTA|5||NEW LISTING 
6a6 
> CAR|HONDA|4||NEW LISTING

Output those records on file2.txt not on file1.txt
Code:
diff file1.txt file2.txt | grep ">" | cut -b 3- > add.txt



Output those records on file1.txt not on file2.txt
Code:
diff file1.txt file2.txt | grep "<" | cut -b 3- > drop.txt



Code:
cat add.txt 
CAR|TOYOTA|5||NEW LISTING 
CAR|HONDA|4||NEW LISTING 

cat drop.txt 
HOME|NEWPORT STREET|1||NEW LISTING 
CAR|TOYOTA|4||NEW LISTING

Note that this compare is matching the entire record which may not match your requirement since you don't want the original record "CAR|TOYOTA|4||NEW LISTING" that changed written to the drop.txt file. You then can look at the join command which will allow you to match based on certain fields/keys in your file to determine if it's truly a dropped record vs a changed record.

mjf
 

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LEARN ABOUT DEBIAN

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.
	      Please notice this option isn't related to the terminal length as in a "80 culums terminal".

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do right to left (RTL) layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter and A4. Default is A4.

       Postscript points
	      Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch.

       --bottom-margin=bm
	      Set bottom margin. Default is 36 postscript points.

       --top-margin=tm
	      Set top margin. Default is 36 postscript points.

       --left-margin=lm
	      Set left margin. Default is 36 postscript points.

       --right-margin=rm
	      Set right margin. Default is 36 postscript points.

       --gutter-width=gw
	      Set gutter width. Default is 40 postscript points.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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