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Full Discussion: Insert text line to specific location CSV
Top Forums Shell Programming and Scripting Insert text line to specific location CSV Post 302732927 by whyte_rhyno on Monday 19th of November 2012 02:19:05 PM
Old 11-19-2012
Insert text line to specific location CSV
In Perl. ***edited question below***

Hey all, I am teaching myself some simple CSV file manipulation and have become a little stuck. Say I have the following layout in the CSV file:

Code:
age,name,location

Is it possible to INSERT data into the CSV into the correct age order. For example, if I had the following data:

Code:
#appending the CSV line by line, not all at once
>>10,Jim,London
>>8,Jon,Paris
>>21,Jen,Rome
>>17,Bob,Washington

It would go in the CSV file in age order as follows (youngest to oldest):

Code:
8,Jon,Paris
10,Jim,London
17,Bob,Washington
21,Jen,Rome

I have a problem in that I don't have access to the useful Text::CSV library, so any solutions that do not involve an import would be a massive bonus (it doesn't matter if it's sloppy/inefficient as it's purely for educational purposes)

Thanks for your time.

---------- Post updated at 07:19 PM ---------- Previous update was at 04:17 PM ----------

Ok, so I've given up hope that it's possible to do what I want. Instead, I'm just going to sort the details on the fly; I'm still having some problems though. I've pieced together this sorting algorithm but it's only printing out memory locations (E.g: ARRAY(0x6a33e10))

Code:
    my @data;
    my @sorted;
    open FH, "<details.csv" || die ("Can't open details.csv"); 
    
    while(<FH>) {
        chomp;
        push @data, [split ',', $_]; #split the line
        @sorted = sort { $b->[0] <=> $a->[0] } @data; #sort based on age
        print "$sorted[0]\t$sorted[1]\t$sorted[2]\n";
    }
    
    close FH;

 

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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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