gdb_basics.md

so typically I run gdb like:

gdb --with-args ./mycmd arg1 arg2

break <function name>                            # set a breakpoint
break <filename>:<function name>:<line_nr>       # set a breakpoint

run                                              # starts the program

<breakpoint hit>

bt                                               # print the backtrace
frame <number>                                   # select which frame to inspect
list                                             # show the source code around the breakpoint
print <var name>                                 # with pointers, structs, and unions you can also cast, dereference, etc using (*, &, ->, (struct type *), etc) 
info locals                                      # print all local variables
step
<repeate any/all of the above>