int.d scripts

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http://forum.xda-developers.com – hello i need help so i have tablet pc rooted and i edit build.prop add some tweaks but i want add scripts to int.d folder do i must have installed kernel or not and how add scripts to stock rom or offical rom just rooted i have ICS 4.0.4 please tell me how add scripts without kernel or any other applications or softwares i just want add scripts for battery,lagfix etc...... (HowTos)