09-16-2011
How to change value in CSV columns and compare two files where Column1 is identical
Hi all,
Could someone help me with the following issue:
1st
I have an CSV file delimiter is ";" I I have a column 7 where I need to do some multiple mathem. operation, I need all values in this columns to be multiplied by 1.5 and create a new CSV file with the replaced values.
2nd.
I have 2 CSV files which have the same number or rows the 1 row is identical in both but the 6th column change in the second, how can I copy this new value from the first csv to the second.
I Suppose that awk should handle this, could you give me some tips, how can I accomplish this tasks.
Thank you in advance.
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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)