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Full Discussion: Splitting up a text file into multiple files by columns
Top Forums UNIX for Dummies Questions & Answers Splitting up a text file into multiple files by columns Post 302719005 by agama on Sunday 21st of October 2012 10:42:32 PM
Old 10-21-2012
Assuming your system will allow 100 concurrent file descriptors to be open at the same time:

Code:
awk '
    {
        for( i = 3; i <= NF; i++ )
            printf( "%s %s %s\n", $1, $2, $(i) ) >i ".txt";
    }
' input-file

Should work.


Per your description 3.txt will contain columns 1,2 and 3; 4.txt will contain 1,2 and 4. There will not be 1.txt nor 2.txt as you indicated you want n.txt where n is the column in addition to 1 and 2. I hope I interpreted that correctly.

---------- Post updated at 22:42 ---------- Previous update was at 22:39 ----------

If your system will not allow 100 concurrently open FDs, then the code below should work -- not as efficient, and you will need to delete all text files if you need to rerun the programme.


Code:
awk '
    {
        for( i = 3; i <= NF; i++ )
        {
            fn = i ".txt";
            printf( "%s %s %s\n", $1, $2, $(i) ) >>fn;
            close( fn );
        }
    }
' input-file

Last edited by agama; 10-21-2012 at 11:46 PM.. Reason: typo
This User Gave Thanks to agama For This Post:
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LEARN ABOUT DEBIAN

bomstrip

BOMSTRIP(1)						    BSD General Commands Manual 					       BOMSTRIP(1)

NAME

     bomstrip, bomstrip-files -- strip the BOM sequence from UTF-8 files

SYNOPSIS

     bomstrip
     bomstrip-files file ...

DESCRIPTION

     The bomstrip utility reads UTF-8 data from its standard input and copies it to its standard output, stripping the BOM (byte-order mark) from
     the beginning of the text if it is present.  There are no command-line options and no parameters.

     The bomstrip-files utility removes the UTF-8 BOM from the specified files, saving each file's original contents with a .bom extension.  It
     uses the bomstrip utility, trying to execute it as ``bomstrip''; if the bomstrip utility is installed under another name, or if a more com-
     plex command is desired, it may be supplied in the BOMSTRIP environment variable.

EXAMPLES

     Strip the BOM, if present, from a text file:

	   bomstrip < bom.txt > nobom.txt

     Strip the BOM, if present, from all text files, backing them up with a .bom extension:

	   bomstrip-files *.txt

     Use the OCAML implementation of bomstrip:

	   env BOMSTRIP='ocaml bomstrip.ocaml' bomstrip-files *.txt

SEE ALSO

     The bomstrip home page: http://www.xs4all.nl/~mechiel/projects/bomstrip/

HISTORY

     The bomstrip utility (in many languages) was written by Mechiel Lukkien, with implementations in various languages sent to him by others,
     including Andreas Gohr, Andrew Gerrand, Berteun Damman, Matthijs Bomhoff, Peter Pentchev, and Ruben Smelik.  The bomstrip-files utility and
     this manual page were written by Peter Pentchev in the hope that they reflect the behavior of all the bomstrip implementations in all lan-
     guages.

AUTHORS

     Mechiel Lukkien <mechiel@xs4all.nl>
     Peter Pentchev <roam@ringlet.net>

BSD
								   June 14, 2008							       BSD
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