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Top Forums Shell Programming and Scripting read the lines of multiple files Post 302666807 by alister on Thursday 5th of July 2012 07:20:43 AM
Old 07-05-2012
Your original problem statement implies and vbe's solution produces a cartesian product. The solutions from others, using paste, produce a simpler merge. Which is appropriate? You seem to be testing the solutions without realizing or commenting on this.

If there are 2 lines in file1 and 2 lines in file2, in which of the following ways should they be combined:

file1line1 file2line1
file1line2 file2line2

or

file1line1 file2line1
file1line1 file2line2
file1line2 file2line1
file1line2 file2line2

Also, to help us help you, provide better feedback. Simply saying "did not work" is not useful. Provide the exact error messages generated on your system (what os and shell are you using?). If there are no errors but the output differs from what you expect, describe how it deviates.Provide some sample input. If there are weird characters showing up, show us the code you ran, the input it used, and tell us exactly what characters they are.

Regards,
Alister

Last edited by alister; 07-05-2012 at 08:29 AM..
 

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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: 1999-08-27; Release Date: 23:37:10Z. 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
23:37:10Z MERGE(1)
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