quit:   Exit gdb
 help:   See commands -> help command
         (see also manpage)
 list:   List program

 break:  Set breakpoint (for stopping);
         >break 27 if (a==b)
 watch:  Set watchpoint (for stopping)
         >watch (i==19 && a>b)
 clear:  Clear all breakpoints
 delete: Delete breakpoint by number 
         (info break)

 run:    Start your program