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Top Forums Shell Programming and Scripting Shell script to apply functions to multiple columns dynamically Post 303025732 by mkathi on Saturday 10th of November 2018 08:45:48 PM
Old 11-10-2018
Hello you are right

I have to pass the input as arrays yes and i did make a typo near the echo

yes the echo at the end is outside the loop so it will only print out the last row i think

issue is even if i pass the target as variable the code is only picking the first value passed generating the md5 and outputting the md5 for that line. I am trying to figure out how can i loop through all the columns passed inside the array and concatenate them using, and then calculate their md5 and then write it back to the file as a new column.

I know its a strange requirement Please point me to the write direction

I m trying something like this with no avail


Code:
#!/usr/bin/sh

target=("id,name")  
target_idx=()   # the column number of that field
{
  # reading header.
for i in $(echo $target | sed "s/,/ /g");do # trying to pass the comma seperated values inside target variable
  IFS=, read -r -a header
  for idx in "${!header[@]}"; do  # and look for the target field in it
    [[ ${header[$idx]} = $target ]] && { target_idx=$idx; break; }
  done
 done
  # then, iterate over lines
  while IFS=, read -r -a line; do
    a=$(echo -n ${line[$target_idx]}|md5sum)
    echo "$line"
  done
}

------ Post updated at 01:45 AM ------

Just a thought may be i should change my thinking. Just throwing it out i still did not figure out how to write the code but i may have a starting point

step one is if i can concatenate all the column names i send as a parameter to the script and then apply md5 function on it and then store the result of the output in a column in the end does this make any sense.
 

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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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