Compare two files and output diff to third file Post: 302239879

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Top Forums Shell Programming and Scripting Compare two files and output diff to third file Post 302239879 by altamaha on Wednesday 24th of September 2008 03:36:26 PM

09-24-2008

Registered User

Compare two files and output diff to third file

I have made several attempts to read two files of ip addresses and eliminate records from file1 that are in file2.

My latest attempt follows. Everything works except my file3 is exactly the same as file1 and it should not be.

Code:

# !/usr/bin/bash
#
# NoInterfaces
# Utility will create a file of ip addresses( file1) from an ARP file from network admin.
# Utility will create a file of interface ip addresses(file2) from an ARP file from network admin.
# Utility will create a file of user ip addresses(file3) from file1 and file2 created within utility
#

# set some variables
DIR=/export/home/gordonl
file1=$DIR/ipstrings     # Large file containing all arp ip strings
file2=$DIR/intfip        # small file containing interface ip strings
file3=$DIR/output.txt    # output file contains all of file1 - file2
# null the files
>$file1
>$file2
>$file3

# Locate all Internet IP Address strings from RtrARP
grep Internet $DIR/RtrARP | cut -d" " -f3 | sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 > $file1

# Locate all Router Interface strings
grep "ip address 1" $DIR/RtrARP | cut -d" " -f4 | sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 > $file2

while read HOST
do
   grep -v "$HOST" $file1 > $file3
done < $file2

thanks in advance for any help.

JB

altamaha

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LEARN ABOUT SUSE

merge

MERGE(1)						      General Commands Manual							  MERGE(1)

NAME

       merge - three-way file merge

SYNOPSIS

       merge [ options ] file1 file2 file3

DESCRIPTION

       merge  incorporates all changes that lead from file2 to file3 into file1.  The result ordinarily goes into file1.  merge is useful for com-
       bining separate changes to an original.	Suppose file2 is the original, and both file1 and file3 are modifications of  file2.   Then  merge
       combines both changes.

       A  conflict  occurs  if	both  file1 and file3 have changes in a common segment of lines.  If a conflict is found, merge normally outputs a
       warning and brackets the conflict with <<<<<<< and >>>>>>> lines.  A typical conflict will look like this:

	      <<<<<<< file A
	      lines in file A
	      =======
	      lines in file B
	      >>>>>>> file B

       If there are conflicts, the user should edit the result and delete one of the alternatives.

OPTIONS

       -A     Output conflicts using the -A style of diff3(1), if supported by diff3.  This merges all changes leading from file2  to  file3  into
	      file1, and generates the most verbose output.

       -E, -e These  options  specify conflict styles that generate less information than -A.  See diff3(1) for details.  The default is -E.  With
	      -e, merge does not warn about conflicts.

       -L label
	      This option may be given up to three times, and specifies labels to be used in place of the corresponding  file  names  in  conflict
	      reports.	 That  is, merge -L x -L y -L z a b c generates output that looks like it came from files x, y and z instead of from files
	      a, b and c.

       -p     Send results to standard output instead of overwriting file1.

       -q     Quiet; do not warn about conflicts.  -V Print 's version number.

DIAGNOSTICS

       Exit status is 0 for no conflicts, 1 for some conflicts, 2 for trouble.

IDENTIFICATION

       Author: Walter F. Tichy.
       Manual Page Revision: 5.7; Release Date: 1995/06/01.
       Copyright (C) 1982, 1988, 1989 Walter F. Tichy.
       Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert.

SEE ALSO

       diff3(1), diff(1), rcsmerge(1), co(1).

BUGS

       It normally does not make sense to merge binary files as if they were text, but merge tries to do it anyway.

GNU
								    1995/06/01								  MERGE(1)