Say the debugged process has a string variable as follows:
char* cmd_str = "set confirm on";
How to execute the command from cmd_str in GDB?
(gdb) $cmd = cmd_str
(gdb) ???
You can use gdb's eval command, which runs printf on its arguments and then evaluates the result as a command.
(gdb) list
1 #include <stdlib.h>
2 main()
3 {
4 char *a = "set confirm off";
5
6 pause();
7 }
(gdb) break 6
Breakpoint 1 at 0x400540: file cmdtest.c, line 6.
(gdb) run
Starting program: ./cmdtest
Breakpoint 1, main () at cmd.c:6
6 pause();
(gdb) show confirm
Whether to confirm potentially dangerous operations is on.
(gdb) printf "%s", a
set confirm off(gdb)
(gdb) eval "%s", a
(gdb) show confirm
Whether to confirm potentially dangerous operations is off.
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