memmove (&cmd.v_variables[1], &cmd.v_variables[0],
(cmd.n_variables - 1) * sizeof *cmd.v_variables);
cmd.v_variables[0] = &casenum_var;
memmove (&cmd.v_variables[1], &cmd.v_variables[0],
(cmd.n_variables - 1) * sizeof *cmd.v_variables);
cmd.v_variables[0] = &casenum_var;