WeenixWorkaround

Add this to the end of kernel/test/kshell/kshell.c and declare it in the associated .h

int kshell_test(kshell_t *ksh,char *command)
{
  char *args[10];
  int argc = 0;
  kshell_get_args(ksh, command, args, KSH_MAX_ARGS, &argc);
  kshell_command_t *cmd;
  if ((cmd = kshell_lookup_command(args[0], strlen(args[0]))) == NULL) {
    kprintf(ksh, "kshell: %s not a valid command\n", args[0]);
    return -1;
  } else {
    return cmd->kc_cmd_func(ksh, argc, args);
  }
}

Run the command in the kernel/main/kmain.c after we construct the kshell.
Insert the following function call about line 365 (after "panic("init: Couldn't create kernel shell\n");")

  	char cmd[100];
		strcpy(cmd, "ls");
		
		while(1) {
			kshell_test(kshell,cmd);	
		}

Edit init.gdb and add on line 5 
break kshell_test

then to run a command in gdb simply 
set command "[your comand here]"
Then type c to run it!