Root access in android How to get root access in android ?. While  I am trying su or sudo in my samsung galaxy core phone ,I am getting /system/bin/sh :sudo :not found
You first have to root your device in order to have root access.
I'd suggest you to have a look here.
Do check for supported devices here [as per devices, samsung galaxy core is supported. Do cross-check whether you own the same model or not]