back->send("\001", 1);	        back->send(str, strlen(str));
if (using_sftp) {  } else { back->send("\001", 1);	        back->send(str, strlen(str)); }
int scp_send_errmsg(char *str){    back->send("\001", 1);	       /* scp protocol error prefix */    back->send(str, strlen(str));    return 0;			       /* can't fail */}