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Top Forums Shell Programming and Scripting Awk Compare File1 File2 on f2 Post 302251323 by RacerX on Sunday 26th of October 2008 08:34:49 PM
Old 10-26-2008
Awk Compare File1 File2 on f2

I'm trying to compare two files using AWK, where if field2 of both files match, replace field1 of file1 with field1 of file2 and if there is no match just print the line of file1.

file1.txt (has empty first field)
Code:
:ABBATOM:B:H:1992
:ABBA TROJAN:B:H:1993
:ABBES FIRST HOPE:B:M:1997
:ABBEYS LENDING:BR:M:1996
:ABBEYS LEGACY:BR:M:1997
:ABBIE VELMA:B:M:1992
:ABBIESRUN:B:M:1995

file2.txt
Code:
31:ABBATOM:B:H:1992
32:ABBA TROJAN:B:H:1993
35:ABBIE VELMA:B:M:1992
36:ABBIESRUN:B:M:1995

DESIRED OUTPUT
Code:
31:ABBATOM:B:H:1992
32:ABBA TROJAN:B:H:1993
:ABBES FIRST HOPE:B:M:97
:ABBEYS LENDING:BR:M:1996
:ABBEYS LEGACY:BR:M:1997
35:ABBIE VELMA:B:M:1992
36:ABBIESRUN:B:M:1995

Any help would be appreciated.

Last edited by RacerX; 10-26-2008 at 09:36 PM.. Reason: made a boo boo
 

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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 RCS'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: 5.8.1; Release Date: 2012-06-06. Copyright (C) 2010-2012 Thien-Thi Nguyen. Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert. Copyright (C) 1982, 1988, 1989 Walter F. Tichy. 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 RCS 5.8.1 2012-06-06 MERGE(1)
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