rb_execarg_commandline 5890 io.c           char *rb_execarg_commandline(const struct rb_execarg *eargp, VALUE *prog);
rb_execarg_commandline 6066 io.c               cmd = rb_execarg_commandline(eargp, &prog);
rb_execarg_commandline 3964 process.c          status = system(rb_execarg_commandline(eargp, &prog));