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Top Forums Shell Programming and Scripting variable inside variable inside loop headache Post 302326638 by hcclnoodles on Thursday 18th of June 2009 10:29:20 AM
Old 06-18-2009
variable inside variable inside loop headache

Hi Gurus

I have a file called /tmp/CMDB which looks like this

Code:
serial: 0623AN1208
hostname: server1
model: x4100
assetID: 1234

I am writing a for loop that will go through this file line by line creating a variable of itself. Using the first iteration of the loop (i.e. the first line) as an example, I want it to create a variable called

db_serial and populate it with value 0623AN1208

on the next iteration create a variable called

db_hostname and populate it with value server1

etc etc

so i have tried

Code:
cat /tmp/CMDB | while read n
do

VAR=db_`echo $n | cut -d: -f1`
VALUE=`echo $n | cut -d: -f2`

eval `echo $VAR`=`echo $VALUE`

done

# echo it all out after the loop has finished

echo "DB serial is set to $db_serial"
echo "DB hostname is set to $db_hostname"
echo "DB model is set to $db_model"
echo "DB Asset ID is set to $db_assetID"


Plus a whole load of other combinations and i just cant get the thing to work


Im sure the problem is with my use of the "eval" command which is effectively using another variable to create a variable, and assigning the value from another variable Smilie

does anybody know what im doing wrong ?Smilie
 

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MSSQL_FETCH_FIELD(3)													      MSSQL_FETCH_FIELD(3)

mssql_fetch_field - Get field information

SYNOPSIS
object mssql_fetch_field (resource $result, [int $field_offset = -1]) DESCRIPTION
mssql_fetch_field(3) can be used in order to obtain information about fields in a certain query result. PARAMETERS
o $result - The result resource that is being evaluated. This result comes from a call to mssql_query(3). o $field_offset - The numerical field offset. If the field offset is not specified, the next field that was not yet retrieved by this function is retrieved. The $field_offset starts at 0. RETURN VALUES
Returns an object containing field information. The properties of the object are: o name - column name. if the column is a result of a function, this property is set to computed#N, where #N is a serial number. o column_source - the table from which the column was taken o max_length - maximum length of the column o numeric - 1 if the column is numeric o type - the column type. EXAMPLES
Example #1 mssql_fetch_field(3) example <?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 $field = mssql_fetch_field($query, $i); // Print the row echo '<tr>'; echo '<td>' . $field->name . '</td>'; echo '<td>' . strtoupper($field->type) . '</td>'; echo '<td>' . $field->max_length . '</td>'; echo '</tr>'; } echo '</tbody>'; echo '</table>'; // Free the query result mssql_free_result($query); ?> SEE ALSO
mssql_field_seek(3). PHP Documentation Group MSSQL_FETCH_FIELD(3)
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