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Top Forums Shell Programming and Scripting Fetching values in CSV file based on column name Post 302871875 by Akshay Hegde on Thursday 7th of November 2013 07:09:44 AM
Old 11-07-2013
Try by the way myself Akshay not Ajay Smilie

Code:
$ cat Header_list.txt
Field2
Field4

Code:
$ cat file
Field1,Field2,Field3,Field4,Field4
abc ,123 ,xyz ,000 ,pqr
mno ,123 ,dfr ,111 ,bbb

Code:
awk 'NR==FNR{
                Cols=Cols (Cols?"|":"")$1
                next
            }

     FNR==1{
                for (i=1;i<=NF;i++) 
                if (match($i,Cols)) 
                Ar[++n]=i
           }

           {
               for (i=1;i<=n;i++) 
               printf (i<n)? $(Ar[i])  FS : $(Ar[i])
               printf "\n"
            }' FS=","  Header_list.txt file

Resulting
Code:
Field2 ,Field4, Field4 
123,  000,  pqr 
123,  111,  bbb

 

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FPUTCSV(3)								 1								FPUTCSV(3)

fputcsv - Format line as CSV and write to file pointer

SYNOPSIS
int fputcsv (resource $handle, array $fields, [string $delimiter = ","], [string $enclosure = '"'], [string $escape_char = " DESCRIPTION
fputcsv(3) formats a line (passed as a $fields array) as CSV and write it (terminated by a newline) to the specified file $handle. PARAMETERS
o $handle -The file pointer must be valid, and must point to a file successfully opened by fopen(3) or fsockopen(3) (and not yet closed by fclose(3)). o $fields - An array of values. o $delimiter - The optional $delimiter parameter sets the field delimiter (one character only). o $enclosure - The optional $enclosure parameter sets the field enclosure (one character only). o $escape_char - The optional $escape_char parameter sets the escape character (one character only). RETURN VALUES
Returns the length of the written string or FALSE on failure. CHANGELOG
+--------+---------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------+ | 5.5.4 | | | | | | | The $escape_char parameter was added | | | | +--------+---------------------------------------+ EXAMPLES
Example #1 fputcsv(3) example <?php $list = array ( array('aaa', 'bbb', 'ccc', 'dddd'), array('123', '456', '789'), array('"aaa"', '"bbb"') ); $fp = fopen('file.csv', 'w'); foreach ($list as $fields) { fputcsv($fp, $fields); } fclose($fp); ?> The above example will write the following to file.csv: aaa,bbb,ccc,dddd 123,456,789 """aaa""","""bbb""" NOTES
Note If PHP is not properly recognizing the line endings when reading files either on or created by a Macintosh computer, enabling the auto_detect_line_endings run-time configuration option may help resolve the problem. SEE ALSO
fgetcsv(3). PHP Documentation Group FPUTCSV(3)
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