gdb命令小抄

Raised signals may be caught:
        catch signal              - all signals
        catch signal <signame>    - a particular signal
Raised exceptions may be caught:
        catch throw               - all exceptions, when thrown
        catch throw <exceptname>  - a particular exception, when thrown
        catch catch               - all exceptions, when caught
        catch catch <exceptname>  - a particular exception, when caught
Thread or process events may be caught:
        catch thread_start        - any threads, just after creation
        catch thread_exit         - any threads, just before expiration
        catch thread_join         - any threads, just after joins
Process events may be caught:
        catch start               - any processes, just after creation
        catch exit                - any processes, just before expiration
        catch fork                - calls to fork()
        catch vfork               - calls to vfork()
        catch exec                - calls to exec()
Dynamically-linked library events may be caught:
        catch load                - loads of any library
        catch load <libname>      - loads of a particular library
        catch unload              - unloads of any library
        catch unload <libname>    - unloads of a particular library
The act of your program's execution stopping may also be caught:
        catch stop
C++ exceptions may be caught:
        catch throw               - all exceptions, when thrown
        catch catch               - all exceptions, when caught

Examine memory: x/FMT ADDRESS.
ADDRESS is an expression for the memory address to examine.
FMT is a repeat count followed by a format letter and a size letter.
Format letters are o(octal), x(hex), d(decimal), u(unsigned decimal),
  t(binary), f(float), a(address), i(instruction), c(char) and s(string).
Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).
The specified number of objects of the specified size are printed
according to the format.

Defaults for format and size letters are those previously used.
Default count is 1.  Default address is following last thing printed
with this command or "print".