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Full Discussion: Compare 2 flat files
Top Forums Shell Programming and Scripting Compare 2 flat files Post 302110938 by strobotta on Friday 16th of March 2007 01:18:20 PM
Old 03-16-2007
The following should work:
Code:
diff old_file new_file | grep ">" | cut -b 3- > new_records.txt

grep entries that are in the newer file only, and cut the first two leading chars that diff outputs.

Records that are in the old file only will not be in the new one.
 

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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. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-------------------+ |Availability | SUNWgnu-diffutils | +--------------------+-------------------+ |Interface Stability | Uncommitted | +--------------------+-------------------+ NOTES
Source for GNU diffutils is available on http://opensolaris.org. diffutils 2.8.1 April 2002 DIFF3(1)
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