fputc('\n', stderr);
fprintf(stderr, "\n      try typing just \"pscp\" for help\n");
void cmdline_error(char *p, ...){    va_list ap;    fprintf(stderr, "pscp: ");    va_start(ap, p);    vfprintf(stderr, p, ap);    va_end(ap);    fputc('\n', stderr);    exit(1);}