Invalid register eip?

I am debugging a c program with gdb in linux terminal, I disassembled it and ran it, then tried to find the memory address the the EIP register. This is what happened:

(gdb) i r eip Invalid register `eip'

Why does it say that my eip register is invalid?

Solution

Is it a 64-bit program? If so, it's rip, not eip.

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