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I have a cck field in a node. I bring this value out in some other form and alter its value, But i am unable to save it back to DB. How should i write it back to table such that node changed date also gets changed. please show some code for this.

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You can use node_save() to do this; CCK will automatically hook into it and update the field values in the database for you:

// Load a node
$node = node_load(1);

// Update the field value
$node->field_field_name = array(0 => array('value' => 'A value'));

// Save the node. Field values are also saved, and the node modified time is updated.
node_save($node);
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You should try with hook_nodeapi(&$node, $op, ...) with $op='presave'.

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