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Top Forums UNIX for Beginners Questions & Answers Replace a field in a comma separated file Post 303044848 by H squared on Thursday 5th of March 2020 08:34:25 AM
Old 03-05-2020
Replace a field in a comma separated file

Hello Experts,

I have a sample comma separated file as having date data in field # 5 and field #8. Field # 4 and 7 (fields before the date field) are indicators:

This is just a sample data, the actual file may have n number of date fields.

Code:
29,A Store,A Street,1,111213,aaaa,0,891213
30,B Store,B Street,0,991213,aaaa,1,61213
31,C Store,C Street,1,51213,aaaaa,1,81213
32,D Store,D Street,0,0,aaaa,1,150323
33,E Store,E Street,1,121212,bbbb,0,0
34,F Store,F Street,1,101212,cccc,0,971212


I need to update field #5 (depending on the value in field # 4 (indicator field)) and field #8 (depending on the value in field#7) and so on as :

1. If field # 4 = 0 and field # 5 <> 0 (say data is : 991213), then append '19' to the string in field # 5 and make the final value
as : 1999-12-13. This is for years before 2000

2. If field # 4 = 0 and field # 5 = 0 (say data is : 0), then the final value as : 0001-01-01

3. If field # 4 = 1, then
a. check if field # 5 has length = 5, then (for data say: 51213), append '200' so that the final value should be 2011-12-13
b. Else, (for data say : 111213), append '20' so that the final value appears as : 2011-12-13.

Input parameters to the script :
$1 : file name
$2 , $3, ........ this depends on the number of date fields which need to be transformed.

I have written the following code:

Code:
#! /usr/bin/ksh

# Read File name
INPUT=$1

 while IFS=',' read -r f1 f2 f3 f4 f5 f6 f7 f8
 do 
 For Century = 0
  if [ $f4 -eq 0 -a $f5 -ne 0 ]
  then
      echo "19$f5" | sed 's/./&-/4;s/./&-/7' ;
  fi

 For 0 in date
  if [ $f4 -eq 0 -a $f5 -ne 0 ]
  then
      echo "00010101" | sed 's/./&-/4;s/./&-/7' ;
  fi

 for century = 1
  if [ $f4 -eq 1 ]
  then
      char_len=`expr length $f5`
      if [ $char_len -eq 5 ]
      then
         echo "200$f5" | sed 's/./&-/4;s/./&-/7';
      else
          echo "20$f5" | sed 's/./&-/4;s/./&-/7';
      fi
  fi

 done < "$INPUT"

I am able to transform the data for Field # 5 only.
Could you please suggest a better approach for this requirement such that I am able to transform the data for field # 8 as well.


Thank you
 

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MSSQL_FIELD_SEEK(3)													       MSSQL_FIELD_SEEK(3)

mssql_field_seek - Seeks to the specified field offset

SYNOPSIS
bool mssql_field_seek (resource $result, int $field_offset) DESCRIPTION
Seeks to the specified field offset. If the next call to mssql_fetch_field(3) won't include a field offset, this field would be returned. PARAMETERS
o $result - The result resource that is being evaluated. This result comes from a call to mssql_query(3). o $field_offset - The field offset, starts at 0. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Using mssql_field_seek(3) on the example for mssql_fetch_field(3) <?php // Connect to MSSQL and select the database mssql_connect('MANGOSQLEXPRESS', 'sa', 'phpfi'); mssql_select_db('php'); // Send a select query to MSSQL $query = mssql_query('SELECT * FROM [php].[dbo].[persons]'); // Construct table echo '<h3>Table structure for 'persons'</h3>'; echo '<table border="1">'; // Table header echo '<thead>'; echo '<tr>'; echo '<td>Field name</td>'; echo '<td>Data type</td>'; echo '<td>Max length</td>'; echo '</tr>'; echo '</thead>'; // Dump all fields echo '<tbody>'; for ($i = 0; $i < mssql_num_fields($query); ++$i) { // Fetch the field information, notice the // field_offset parameter is not set. See // the mssql_field_seek call below $field = mssql_fetch_field($query); // Print the row echo '<tr>'; echo '<td>' . $field->name . '</td>'; echo '<td>' . strtoupper($field->type) . '</td>'; echo '<td>' . $field->max_length . '</td>'; echo '</tr>'; // Move the internal seek pointer to the next // row in the result set mssql_field_seek($query, $i + 1); } echo '</tbody>'; echo '</table>'; // Free the query result mssql_free_result($query); ?> SEE ALSO
mssql_fetch_field(3). PHP Documentation Group MSSQL_FIELD_SEEK(3)
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