Think you have to install sql server server pack to all the SQL Server in a Server. and Attended installation takes much time and human interferance, here is a simple idea solution for it .Install SQL Server Latest Service Packs from Command Prompt. its the easiest method to implement.
Before proceding please take the FULL Backup of the System databases, which are helpfull at any for ROLL backup Service Pack.
we can easliy uninstall sql server service pack from appwiz.cpl. but which is not possible with SQL Server 2005 and Below
Copy The server pack to a location and then pass
Open Command Prompt wiht RunAs Administrator. browse to the service pack folder
once the above parameter is passed you can see the screen below.
to comfirm the server pack installtion summary.txt from the logpath
Program FilesMicrosoft SQL Server100Setup BootstrapLog
check the screen shot below