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Full Discussion: Find diff between two patterns in two files and append
Top Forums UNIX for Dummies Questions & Answers Find diff between two patterns in two files and append Post 302725631 by DGPickett on Friday 2nd of November 2012 12:06:35 PM
Old 11-02-2012
If you store one file in appropriate associative arrays, and then update it from a second file, you can then disgorge the updated data as a normalized file. Deletes would be in how updates are handled, that new sections replace whole old corresponding sections. You build a string key for your associative array just like the prefix needed for the comm solution. Think of a system with the appearance of just one disk with just one big directory and / is just a file name character. It works OK because this directory is a random hash container.

Processing the data into a working form with hierarchy prefixes on every line means you can sort and comm them, but as I say, if the order is important, you need to number them at that level of the profix. After processing for changes, you can reverse the process to make a normalized output file with hierarchy. (The funny thing about protocols in communication is that each protocol essentially adds more prefixes to the message, like html in http in tcp in ip in ethernet.)
Last edited by DGPickett; 11-02-2012 at 01:16 PM..
This User Gave Thanks to DGPickett For This Post:
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LEARN ABOUT MINIX

bdiff

bdiff(1)							   User Commands							  bdiff(1)

NAME

       bdiff - big diff

SYNOPSIS

       bdiff filename1 filename2 [n] [-s]

DESCRIPTION

       bdiff  is  used in a manner analogous to diff to find which lines in filename1 and filename2 must be changed to bring the files into agree-
       ment. Its purpose is to allow processing of files too large for diff. If filename1 (filename2) is -, the standard input is read.

       bdiff ignores lines common to the beginning of both files, splits the remainder of each file into n-line segments, and invokes diff on cor-
       responding segments. If both optional arguments are specified, they must appear in the order indicated above.

       The  output  of	bdiff  is exactly that of diff, with line numbers adjusted to account for the segmenting of the files (that is, to make it
       look as if the files had been processed whole). Note:  Because of the segmenting of the files, bdiff does not necessarily find  a  smallest
       sufficient set of file differences.

OPTIONS

       n	The  number  of line segments. The value of n is 3500 by default. If the optional third argument is given and it is numeric, it is
		used as the value for n. This is useful in those cases in which 3500-line segments are too large for diff, causing it to fail.

       -s	Specifies that no diagnostics are to be printed by bdiff (silent option). Note:  However, this does not suppress possible diagnos-
		tic messages from diff, which bdiff calls.

USAGE

       See largefile(5) for the description of the behavior of bdiff when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

FILES

       /tmp/bd?????

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       diff(1), attributes(5), largefile(5)

DIAGNOSTICS

       Use help for explanations.

SunOS 5.10							    14 Sep 1992 							  bdiff(1)
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