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Full Discussion: CSV with commas in field values, remove duplicates, cut columns
Top Forums Shell Programming and Scripting CSV with commas in field values, remove duplicates, cut columns Post 302580108 by Corona688 on Wednesday 7th of December 2011 02:17:10 PM
Old 12-07-2011
First, selecting 150 fields is tricky when you've got a complex delimiter. You could do it in awk, but only some versions of awk, and it probably wouldn't be fast enough. Do you have a C compiler?

Code:
#include <stdio.h>
#include <string.h>

#define FIELDS  150

int main(void)
{
        char buf[32768];

        while(fgets(buf, 32768, stdin))
        {
                int n;
                char *c=strstr(buf, "\",\""); // Find end of 1st field

                // Find end of nth field after
                for(n=0; c && (n<(FIELDS-1)); n++) 
                        c=strstr(c+1, "\",\"");

                if(c)  strcpy(c+1, "\n"); // end the line early
                fputs(buf, stdout); // print the line again
        }
}

Code:
$ gcc 150cols.c -o 150cols
$ cat 200cols
"1:asdf","2:asdf","3:asdf","4:asdf",...,"199:asdf","200:asdf"
$ ./150cols < 200cols > 150cols
$ cat 150cols
"1:asdf","2:asdf","3:asdf","4:asdf","5:asdf","6:asdf",...,"150:asdf"

Now that you can do that, I think you're going to need to sort your data in order to remove duplicates. The alternative, storing up to 10 gigabytes in memory during processing so you can tell whether a line's duplicate or not, just isn't feasible. So use it in combination with sort to remove duplicate lines:
Code:
sort -u < input | ./150cols > output

 

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LEARN ABOUT DEBIAN

image::exiftool::import

Image::ExifTool::Import(3pm)				User Contributed Perl Documentation			      Image::ExifTool::Import(3pm)

NAME

       Image::ExifTool::Import - Import CSV and JSON database files

SYNOPSIS

	   use Image::ExifTool::Import qw(ReadCSV ReadJSON);

	   $err = ReadCSV($csvFile, \%database);

	   $err = ReadJSON($jsonfile, \%database);

DESCRIPTION

       This module contains routines for importing tag information from CSV (Comma Separated Value) and JSON (JavaScript Object Notation) database
       files.

EXPORTS

       Exports nothing by default, but ReadCSV and ReadJSON may be exported.

METHODS

   ReadCSV / ReadJSON
       Read CSV or JSON file into a database hash.

       Inputs:
	   0) CSV file name.

	   1) Hash reference for database object.

	   2) Optional flag to set '-' values to undef in the database.  (Used for deleting tags.)

	   3) [ReadJSON only] Optional character set for converting Unicode escape sequences in strings.  Defaults to "UTF8".  See the ExifTool
	   Charset option for a list of valid settings.

       Return Value:
	   These functions return an error string, or undef on success and populate the database hash with entries from the CSV or JSON file.
	   Entries are keyed based on the SourceFile column of the CSV or JSON information, and are stored as hash lookups of tag name/value for
	   each SourceFile.

AUTHOR

       Copyright 2003-2011, Phil Harvey (phil at owl.phy.queensu.ca)

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       Image::ExifTool(3pm)

perl v5.12.4							    2011-03-12					      Image::ExifTool::Import(3pm)
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