bash/scan_tty.sh

   1 #!/bin/bash
   2
   3 scan_tty() {
   4         port="$1"
   5         rate="$2"
   6         timeout 1 cat < "$port" >/dev/null;
   7         stty -F "$port" "$rate" cs8 cread clocal
   8         timeout 1 cat < "$port" >/dev/null;
   9         (
  10                 banner="$(timeout 7 cat < "$port" | tr '\r\n[:cntrl:]' '...' | grep -i '[a-z0-9]' )"
  11                 [ -n "$banner" ] && echo -e "$port $rate:\t$banner"
  12                 #echo "$port:$rate:$banner"
  13         ) &
  14         stty -F "$port" "$rate" cs8 cread clocal
  15         sleep 1
  16         #Windows newlines are fore HP ProCurve Switches...
  17         #echo -ne '\x03\r\n\x04\x03\r\n\r\n\r\n' > "$port"
  18         echo -ne '\x03\r\n\x04\x03' > "$port"
  19         sleep 3
  20         echo -ne '\r\n\r\n\r\n' > "$port"
  21         wait
  22 }
  23
  24 printf '\033[?7l'
  25 for port in /dev/ttyUSB*; do
  26         for rate in 115200 38400; do
  27                 #echo -ne "\r$port:$rate:     "
  28                 banner="$(scan_tty "$port" "$rate")";
  29                 [ -n "$banner" ] && echo "$banner";
  30                 echo "$banner" | egrep -i 'linux|root|login|password|user|connect|invalid' >/dev/null && break;
  31         done &
  32 done;
  33 wait
  34 printf '\033[?7h'