Emacs
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ALT-x
gdb
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Run GDB under Emacs.
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CTL-h m
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Describe GDB mode.
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ALT-s
step
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Step one line.
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ALT-n
next
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Next line.
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ALT-i
stepi
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Step one instruction.
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CTL-c CTL-f
finish
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Finish current stack frame.
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ALT-c
up
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Up arg frames.
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ALT-d
down
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Down arg frames.
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CTL-x &
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Copy number from point, insert at end.
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CTL-x SPC
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Set break at point (in source file).