+void usage(const char* argv0)
+{
+ fprintf(stderr, "Usage: %s [options] <device>\n", argv0);
+ fprintf(stderr, "Options:\n");
+ fprintf(stderr, " -d [+|-] create short positive/negative pulse on DTR\n");
+ fprintf(stderr, " -e ignore '~.' escape sequence\n");
+ fprintf(stderr, " -n do not switch the device to raw mode\n");
+ fprintf(stderr, " -r [+|-] create short positive/negative pulse on RTS\n");
+ fprintf(stderr, " -s <baudrate>\n");
+ fprintf(stderr, " -v verbose\n");
+}