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Top Forums Shell Programming and Scripting Replace line in file with line in another file based on matching string Post 302588471 by luckycharm on Monday 9th of January 2012 04:53:36 AM
Old 01-09-2012
Replace line in file with line in another file based on matching string

Hi

I am not the best scripter in the world and have run into a issue which you might be able to guide me on...

I have two files.

File1 :
Code:
A123, valueA, valueB
B234, valueA, valueB
C345, valueA, valueB
D456, valueA, valueB
E567, valueA, valueB
F678, valueA, valueB

File2:
Code:
C345, valueX, valueY
D456, valueX, valueY

I basically want to match the lines in the file1 and file2 based on the value of the first col in both files. If these values match then replace the entry in file1 with the entry in file2

Output:

Code:
A123, valueA, valueB
B234, valueA, valueB
C345, valueX, valueY
D456, valueX, valueY
E567, valueA, valueB
F678, valueA, valueB


Please note file1 is a million lines long so loops and greps take a long time!

Thanks a mil in advance

KB

Last edited by Franklin52; 01-09-2012 at 06:24 AM.. Reason: Please use code tags for code and data samples, thank you
 

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merge(1)																  merge(1)

NAME
merge - three-way file merge SYNOPSIS
merge [-Llabel1 [-Llabel3]] [-p] [-q] file1 file2 file3 DESCRIPTION
merge incorporates all changes that lead from file2 to file3 into file1. The result goes to standard output if -p is present, into file1 otherwise. merge is useful for combining separate changes to an original. Suppose file2 is the original, and both file1 and file3 are modifications of file2. Then merge combines both changes. An overlap occurs if both file1 and file3 have changes in a common segment of lines. On a few older hosts where diff3 does not support the -E option, merge does not detect overlaps, and merely supplies the changed lines from file3. On most hosts, if overlaps occur, merge out- puts a message (unless the -q option is given), and includes both alternatives in the result. The alternatives are delimited as follows: <<<<<<< file1 lines in file1 ======= lines in file3 >>>>>>> file3 If there are overlaps, the user should edit the result and delete one of the alternatives. If the -L label1 and -L label3 options are given, the labels are output in place of the names file1 and file3 in overlap reports. DIAGNOSTICS
Exit status is 0 for no overlaps, 1 for some overlaps, 2 for trouble. IDENTIFICATION
Author: Walter F. Tichy. Revision Number: 1.1.6.2; Release Date: 1993/10/07. Copyright (C) 1982, 1988, 1989 by Walter F. Tichy. Copyright (C) 1990, 1991 by Paul Eggert. SEE ALSO
diff3(1), diff(1), rcsmerge(1), co(1) merge(1)
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