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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 302725111 by DGPickett on Thursday 1st of November 2012 05:09:59 PM
Old 11-01-2012
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.
Last edited by DGPickett; 11-01-2012 at 06:16 PM..
 

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LEARN ABOUT CENTOS

comm

COMM(1) 							   User Commands							   COMM(1)

NAME

       comm - compare two sorted files line by line

SYNOPSIS

       comm [OPTION]... FILE1 FILE2

DESCRIPTION

       Compare sorted files FILE1 and FILE2 line by line.

       With  no  options,  produce three-column output.  Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and
       column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
	      check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
	      do not check that the input is correctly sorted

       --output-delimiter=STR
	      separate columns with STR

       --help display this help and exit

       --version
	      output version information and exit

       Note, comparisons honor the rules specified by 'LC_COLLATE'.

EXAMPLES

       comm -12 file1 file2
	      Print only lines present in both file1 and file2.

       comm -3 file1 file2
	      Print lines in file1 not in file2, and vice versa.

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report comm translation bugs to <http://translationproject.org/team/>

AUTHOR

       Written by Richard M. Stallman and David MacKenzie.

COPYRIGHT

       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       join(1), uniq(1)

       The full documentation for comm is maintained as a Texinfo manual.  If the info and comm programs are properly installed at your site,  the
       command

	      info coreutils 'comm invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								   COMM(1)
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