• bt n：显示栈顶的几个层的信息；
• bt -n：显示栈底的几个层的信息；

• f n：n表示某一个栈帧的编号，默认为当前栈顶的栈信息（即frame 0）；
• info(i) f：查看当前栈层的信息，大多数为运行时的内存地址；

• p 变量名；
• p *array@len：array为数组的首地址，len为数据的长度；
• p 数组名：可展现详细的数组信息
• set print pretty on：可以很漂亮的输出接口体

i register

  info address -- Describe where symbol SYM is stored.  
  info all-registers -- List of all registers and their contents, for selected stack frame.  
  info args -- All argument variables of current stack frame or those matching REGEXPs.   
  info auto-load -- Print current status of auto-loaded files.  
  info auxv -- Display the inferior's auxiliary vector.  
  info bookmarks -- Status of user-settable bookmarks .  
  info breakpoints -- Status of specified breakpoints (all user-settable breakpoints if no argument). 
  info checkpoints -- IDs of currently known checkpoints. 
  info classes -- All Objective-C classes, or those matching REGEXP. 
  info common -- Print out the values contained in a Fortran COMMON block. 
  info copying -- Conditions for redistributing copies of GDB. 
  info dcache -- Print information on the dcache performance. 
  info display -- Expressions to display when program stops, with code numbers. 
  info exceptions -- List all Ada exception names. 
  info extensions -- All filename extensions associated with a source language. 
  info files -- Names of targets and files being debugged. 
  info float -- Print the status of the floating point unit. 
  info frame -- All about the selected stack frame. 
  info frame-filter -- List all registered Python frame-filters. 
  info functions -- All function names or those matching REGEXPs. 
  info guile -- Prefix command for Guile info displays. 
  info handle -- What debugger does when program gets various signals. 
  info inferiors -- Print a list of inferiors being managed. 
  info line -- Core addresses of the code for a source line. 
  info locals -- All local variables of current stack frame or those matching REGEXPs. 
  info macro -- Show the definition of MACRO, and it's source location. 
  info macros -- Show the definitions of all macros at LINESPEC, or the current source location. 
  info mem -- Memory region attributes. 
  info module -- Print information about modules. 
  info modules -- All module names, or those matching REGEXP. 
  info os -- Show OS data ARG. 
  info pretty-printer -- GDB command to list all registered pretty-printers. 
  info probes -- Show available static probes. 
  info proc -- Show additional information about a process. 
  info program -- Execution status of the program. 
  info record -- Info record options. 
  info registers -- List of integer registers and their contents, for selected stack frame. 
  info scope -- List the variables local to a scope. 
  info selectors -- All Objective-C selectors, or those matching REGEXP. 
  info set -- Show all GDB settings. 
  info sharedlibrary -- Status of loaded shared object libraries. 
  info signals -- What debugger does when program gets various signals. 
  info skip -- Display the status of skips. 
  info source -- Information about the current source file. 
  info sources -- All source files in the program or those matching REGEXP. 
  info stack -- Backtrace of the stack, or innermost COUNT frames. 
  info static-tracepoint-markers -- List target static tracepoints markers. 
  info symbol -- Describe what symbol is at location ADDR. 
  info target -- Names of targets and files being debugged. 
  info tasks -- Provide information about all known Ada tasks. 
  info terminal -- Print inferior's saved terminal status. 
  info threads -- Display currently known threads. 
  info tracepoints -- Status of specified tracepoints (all tracepoints if no argument). 
  info tvariables -- Status of trace state variables and their values. 
  info type-printers -- GDB command to list all registered type-printers .
  info types -- All type names, or those matching REGEXP. 
  info unwinder -- GDB command to list unwinders. 
  info variables -- All global and static variable names or those matching REGEXPs. 
  info vector -- Print the status of the vector unit. 
  info vtbl -- Show the virtual function table for a C++ object. 
  info warranty -- Various kinds of warranty you do not have. 
  info watchpoints -- Status of specified watchpoints (all watchpoints if no argument). 
  info win -- List of all displayed windows. 
  info xmethod -- GDB command to list registered xmethod matchers.