GDB: basics

Before Debugging, generating the debugging info using gcc -g3 *.c/cpp;

then gdb ~.out/exe

using commands:

b [n]　　　　　　set breakpoint at line n

r　　　　　　　　[re]run the program

l　　　　　　　　look the code around cur-line

n　　　　　　　　step into

c　　　　　　　　continue run

x/nfu &i　　　　check ram after i. n=int; f=2t8o16x float(f), char(c), string(s),instruction(i), unsigned decimal(u), address(a); u=bhwg, byte/short/int/double

p i　　　　　　　　print var i value

p/x i　　　　　　print i as hex

 

create a file named debugscript: r command parameters..

run gdb and input souce debugscript.. start running script with that script...