What i want to do is that i want a script to change the port number in sql server services in configuration manager. Though i can change manually by going directly to configuration manager but i need a script for some purpose. If anybody know, please fwd it to me.

look at this.... although this only reads, I'm sure there is a registry method to write to the registry as well. I would take a backup of the registry before I'd go poking my fingers around in there as well as make sure I'd do this in a sandbox area too.

http://www.databasejournal.com/features/mssql/article.php/3764516

[EDIT]
upon further digging...here is a script fragment...


$protocolproperty=Get-WmiObject -namespace root\Microsoft\SqlServer\ComputerManagement -class ClientNetworkProtocolProperty `
-filter "PropertyName='Default Port'"
$protocolproperty.SetNumericalValue(7001)

this came from the same site I mentioned above but different article...

http://www.databasejournal.com/features/mssql/article.php/3709441