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Full Discussion: Conditional awk
Top Forums Shell Programming and Scripting Conditional awk Post 302833583 by EAGL€ on Wednesday 17th of July 2013 12:04:24 PM
Old 07-17-2013
Quote:
Originally Posted by Corona688
Yes, if(length($1) == 2) { ... } ought to work.

awk is designed to process big flatfiles, it should do well here. Thousands of files of thousands of lines comes to millions of lines, which is not unfeasible.

There's always ways to make things faster, of course. Will you be doing lots of things like
Code:
awk '{...}' file1 file2 > output
awk '{...}' file1 file3 >> output
awk '{...}' file1 file4 >> output

If so, you could do awk '{...}' file1 file2 file3 file4 ... > output
...which would save a lot of time since file1 wouldn't need to be read thousands of times, just once.

If you need different files for each one that's still possible, but would need changes to the code.

Hello Corona,

First of all thanks a lot,
Let me make the description of files spesific :
Code:
file 1.txt will have lets say 2000 rows, and there will be a few tousands of files like it. Besides file 2.txt is just one file with only one column but with 10.000 lines.

So would it work well? or should i divide file 2.txt to lets say 100 files and in a for-do loop check things?
 

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LEARN ABOUT OPENDARWIN

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: 1.1.1.1; Release Date: 2002/04/30.
       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
								    2002/04/30								  MERGE(1)
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