GDB Short Reference
    by Gary M. Zoppetti
 (Emphasis on x86 Assembly)
=============================

Invoke gdb thus:
  gdb objectFile
    (make sure you compiled source code with -g switch)

break [LOCATION] [if CONDITION]
  Set breakpoint (or watchpoint) at specified address

display [EXP]
  Print value of expression EXP each time program stops
  Display all currently requested auto-display expressions
    with no args

undisplay 
  Cancel display requests previously made

print EXP
  Print value of expression EXP

x/FMT ADDRESS
  Examine memory address ADDRESS
  FMT is a format with repeat count followed by a format 
    letter and a size letter

run
  Start debugged program

ni
  Step one instruction, but proceed through subroutine calls

si
  Step one instruction exactly

continue
  Continue program being debugged, after signal or breakpoint

finish
  Execute until selected stack frame returns

until 
  Execute until the program reaches a source line greater than 
    the current or a specified location within the current frame

info reg
  List integer registers and their contents, for selected stack frame

info break
  List status of user-settable breakpoints and watchpoints

delete [breakpoints]
  Delete breakpoints

info stack
  Show backtrace of the stack

help
  Print list of commands

disassemble
  Disassemble a specified section of memory

Common Command Sequences
========================

break main
display/i $pc
run

ni or si
...
p/FMT $eax
...
ni or si
x/FMT address
continue