How does linuxcnc remeber home position?

When we dont have a linear encoder on bed, how does it remeber its last poition when there is power failure?

regards
vallab

You cannot thrust any stored value for accuracy.
You must home to ensure a proper "real" coordinate.

Can you explain how it goes to home position?
Does it identify home position by limit switch

yes when an encoder is not available it is usual to use a home or limit switch

The most (very accurate) accurate method is to use an encoder with index signal and a microswitch.
It works more or less like this:
The machine moves until it hits the microswitch, then is moves in the opposite direction until it finds the index signal of the encoder.
Since the index signal of the encoder is only one position per turn, it will provide a very accurate homing value.