All notes
Byebug

Intro

---------- Program Stack
b[ack]t[race] — a.k.a. “w[here]”
Display stack trace.
f[rame] <frame-number>
Moves to <frame-number> (frame numbers are shown by bt). With no argument, shows the current frame.
up <number>
Move up <number> frames (or 1, if no number specified).
down <number>
Move down <number> frames (or 1, if no number specified).