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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 302725131 by legato22 on Thursday 1st of November 2012 05:34:11 PM
Old 11-01-2012
Quote:
Originally Posted by DGPickett
With comm (and sort) you can select lines that are common, a only, b only in any combination with tab markers of which is which. Man Page for comm (opensolaris Section 1) - The UNIX and Linux Forums Think of the files as sets of lines, and comm can tell you, for files sorted unique, what is a not b, a and b or b not a.

Now, if there is a multilevel structure within the file, you need to preprocess it so detail lines have category prefixes, like "# R:" above. If order is important after "# R:", you need to number the lines in each group, but that will accentuate minor differences.

Diff can process two files for differences and provides options for several flavors of output. There is even a diff3 so if you have a common starting point and files 2 developers made from it, you can merge their changes using the -e output into ex, to make the fourth corner. Of course, if they changed the same lines, it has more trouble -- time to have a local coding standard or a diff-friendly code beautifier.
Thanks, good idea...preprocessing the data. Let me think about how to do it. I tried the comm command. Would be fine, but the main issue is the multilevel structure. For now, I'm using an awk script to just find what is present in file 2 that is not present in file 1, manually going back to file 1 and repasting it under appropriate sections.
 

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LEARN ABOUT PLAN9

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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