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Full Discussion: Require compare command to compare 4 files
Top Forums Shell Programming and Scripting Require compare command to compare 4 files Post 302448600 by drl on Thursday 26th of August 2010 11:51:05 AM
Old 08-26-2010
Hi.

Perhaps:
Code:
NAME
       diff3 - compare three files line by line

could be generalized to handle n files.

However, you'd need to look over the source.

You haven't said much about what you'd like to see. Do you want simply an indication that the files are the same or different? Do you need to know details on a line-by-line basis? Can the file content be reordered?

One could look at the lengths of the files. If they differ in length, then they cannot be the same. If the length is the same, then you could use a check-summing code, say md5sum, to calculate a numeric signature for the files, and then compare all the signatures.

If you want detailed attempts from responders here, then post some representative samples of 4 files, along with how you think the output should be displayed.

Best wishes ... cheers, drl
 

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LEARN ABOUT NETBSD

diff3

DIFF3(1)							   User Commands							  DIFF3(1)

NAME

       diff3 - compare three files line by line

SYNOPSIS

       diff3 [OPTION]... MYFILE OLDFILE YOURFILE

DESCRIPTION

       Compare three files line by line.

       -e  --ed
	      Output unmerged changes from OLDFILE to YOURFILE into MYFILE.

       -E  --show-overlap
	      Output unmerged changes, bracketing conflicts.

       -A  --show-all
	      Output all changes, bracketing conflicts.

       -x  --overlap-only
	      Output overlapping changes.

       -X     Output overlapping changes, bracketing them.

       -3  --easy-only
	      Output unmerged nonoverlapping changes.

       -m  --merge
	      Output merged file instead of ed script (default -A).

       -L LABEL  --label=LABEL
	      Use LABEL instead of file name.

       -i     Append `w' and `q' commands to ed scripts.

       -a  --text
	      Treat all files as text.

       -T  --initial-tab
	      Make tabs line up by prepending a tab.

       --diff-program=PROGRAM
	      Use PROGRAM to compare files.

       -v  --version
	      Output version info.

       --help Output this help.

       If a FILE is `-', read standard input.

AUTHOR

       Written by Randy Smith.

REPORTING BUGS

       Report bugs to <bug-gnu-utils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.

       This  program  comes  with NO WARRANTY, to the extent permitted by law.	You may redistribute copies of this program under the terms of the
       GNU General Public License.  For more information about these matters, see the file named COPYING.

SEE ALSO

       The full documentation for diff3 is maintained as a Texinfo manual.  If the info and diff3 programs are properly installed  at  your  site,
       the command

	      info diff

       should give you access to the complete manual.

diffutils 2.8.1 						    April 2002								  DIFF3(1)
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