Deleted kexts, OSX stuck on boot, anything else to do on Recovery Mode Terminal?

Hi guys.

Somtimes I am a complete noob, so I deleted two kexts from S/L/E and now boot hangs on kernel panic. I still can enter Recovery Mode and use Terminal, so I've put the two kexts on a USB pendrive and after some struggle I've managed to succefully copy them using Terminal, but the boot is still stuck on kernel panic. As I remember, these are the commands I've typed:

mount -rw

cp -a /Volumes/usb-stick/name.kext /Volumes/my-osx-drive/System/Library/Extensions/

Is there anything else I should do? Is anything wrong? Should I type some command else? For instance, should I type something to fix permissions and rebuild cache?

Thanks a lot!