I am planning to do a project where RPi3 will b run by a powerbank. But I am bit confused with power consumption and in my project I am not running any heavy load expect camera interface. In my case RPi3 will run a bash script on startup and enable camera interface. But I like to do it on CLI interface while startup. So using GUI generally consumes more power than CLI?
Well, an HDMI connection will use a tiny bit more power. As for the OS itself, running the GUI requires more software, and that would put more load on the SoC, but I doubt it would have a large impact on total power consumption. And as klricks said above, the Desktop version of Raspbian can be configured to boot to the CLI (not load the GUI).